Licht

Vier is beter dan één (Wetenschapsmuseum, Valencia)

De bovenstaande foto doet u wellicht denken aan een van de beroemdste kunstwerken uit de afgelopen eeuw, maar dat is helaas in zwartwit, terwijl ik het vandaag wil hebben over kleur. Iets wat natuurlijk feitelijk niet bestaat: het is slechts de visualisering die onze hersenen geven aan de door de kegeltjes in onze ogen geregistreerde elektromagnetische straling. Anders gezegd, onze ogen kunnen straling met een golflengte tussen de 380 en 780 nanometer waarnemen en onze hersenen zetten die waarneming om in violet, blauw, groen, geel, oranje en rood. Kortere golflengtes, die we dus niet kunnen zien, noemen we ultraviolet. Ze zijn energierijker per deeltje (foton), met röntgenstraling als extreem voorbeeld. Golflengtes langer dan 780 nanometer heten infrarood en zijn minder energierijk.

Een kleur is dus niets anders dan onze mentale interpretatie van een golflengte. Een van de doorbraken van de twintigste-eeuwse wetenschap is nu dat we de golflengtes die onze ogen niet kunnen registreren, toch kunnen bestuderen. Dat is, althans in principe, heel simpel: je bouwt een apparaat dat voor het oog niet waarneembare golflengtes kan ontvangen (zoals een radio-ontvanger). Omdat je diverse golflengtes analyseert, heet zo’n apparaat een multispectrale camera.

Vervolgens geef je een computer opdracht om de geregistreerde golflengtes te koppelen aan iets dat wel waarneembaar is voor het menselijk oog. Is het 150 nanometer, dan geven we het weer alsof het 500 nanometer is; is het 300 nanometer, dan maken we er 650 van; is het 400 nanometer, dan wordt het 750. Voilà: we hebben ultraviolet omgezet naar voor mensen zichtbaar licht. Dat zijn dus false colors.

Bovenstaande foto maakte ik in januari in het wetenschapsmuseum in Valencia en toont een Renaissance-schilderij waarvan de naam me even niet te binnen wil schieten. Het doek is op verschillende manieren belicht door de Franse fotograaf Pascal Cotte.

De eerste foto toont wat er zichtbaar is in infrarode straling tussen 850 en 950 nanometer. Het is omgezet in grijstinten; bij de tweede en derde afbeelding is de informatie uit de multispectrale camera omgezet naar gelige en blauwige kleuren. Omdat de golflengte zo groot is, krijg je niet zo veel detail te zien, maar de retouches die tijdens het schilderen zijn aangebracht, kunnen op deze manier wel zichtbaar worden gemaakt. We kijken als het ware door de vernislaag en het eindresultaat heen naar een eerdere fase van het schilderij.

De vierde van de hierboven getoonde weergaves van het Renaissance-schilderij is het leukst. Door alle soorten straling te gebruiken, van röntgen via ultraviolet en zichtbaar naar infrarood, kun je vaststellen welke pigmenten zijn gebruikt. Lapislazuli licht bij andere golflengtes op dan kwiksulfide. Bovendien kun je vaststellen wat het effect is van de vernis. De computer kan die resultaten omzetten naar de kleuren zoals die ooit zichtbaar zijn geweest, en zo krijgen we dus een Mona Lisa zoals ze ooit bedoeld is geweest. De ietwat blauwige bergen zijn dus werkelijk wat Leonardo da Vinci wilde schilderen.

Het is met dit soort analyses dat de gekleurde standbeelden uit de Oudheid zijn gereconstrueerd die u wel zult kennen. Of lees er hier of daar meer over.

Kleurreconstructie van een reliëf van de goden van het antieke Filippopolis (Archeologisch Museum, Plovdiv)Gereconstrueerde beschildering van een sculptuurfragment uit de Afaia-tempel op Aigina (Liebieghaus, Frankfurt a.M.)

[De oudheidkundige wetenschappen zijn in de eerste plaats wetenschappen. Een overzicht van stukjes over het wetenschappelijk aspect, vindt u daar.]

#infraroodLicht #kleur #LeonardoDaVinci #licht #MonaLisa #PascalCotte #röntgenstraling #ultravioletLicht

Archangel Uriel

Uriel means “God is my flame.” His name could be spelled Auriel or Oriel. He’s one of the archangels who’s mentioned in Rabbinic tradition & in certain Christian traditions.

He’s well known in the Russian Orthodox tradition & in folk Catholicism (in both he’s considered to be 1 of the 7 major archangels). In Anglicanism, he’s also well known in European esoteric medieval literature.

Uriel is also known as a master of knowledge & archangel of wisdom. He’s associated with the truth.

In apocryphal, kabbalistic, & occult works, Uriel has been equated (or confused) with Urial, Nuriel, Uryan, Jeremiel, Vretil, Sariel, Puruel, Phanuel, Azrael, & Raphael.

In the Secret Book of John (an early Gnostic work), Uriel is placed in control of the demons who help Yaldabaoth create Adam.

Of the 7 Archangels in the angelology of Judaism, only 2 of them (Gabriel & Michael) are mentioned by name in the canonized Jewish scripture. Where a 4th archangel is added to the named 3 (to represent the 4 cardinal points), Uriel is generally the 4th. Uriel is listed as the 4th angel by Christian Gnostics, under the name of Phanuel.

Uriel appears in the 2nd Book of Esdras, which is found in the Biblical apocrypha (called Esdras IV in the Vulgate). In this, the prophet Ezra asks God a series of questions, & God sends Uriel to instruct him. According to the Revelation of Esdras, the angels who will rule at the end of the world are Michael, Gabriel, Uriel, Raphael, Gabuthelon, Beburos, Zebuleion, Aker, & Arphugitonos. The final 5 listed appear only in the book & nowhere else in apocryphal or apocalyptics works.

In Christian apocryphal Gospels, Uriel plays a role (differing between the sources) in the rescue of Jesus’ cousin, John the Baptist, from the Massacre of the Innocents ordered by King Herod. He carries John & his mom, St. Elizabeth, to join the Holy Family after their flight into Egypt. Their reunion is pictured in da Vinci’s Virgin of the Rocks (a.k.a. Madonna of the Rocks).

Uriel is often identified as a cherub & the angel of repentance. He stood at the Garden of Eden with a fiery sword, or as the angel who’s over the world & over Tartarus. In the Apocalypse of Peter, he appears as the angel of repentance, who is graphically represented as being as pitiless as any demon.

In the Life of Adam & Eve, Uriel is regarded as the spirit (1 of the cherubs) of the 3rd chapter of Genesis. He’s also identified as 1 of the angels who helped bury Adam & Abel in Eden. He checked the doors of Egypt for lamb’s blood during the plague. He held the key to the pit during the end times, & led Abraham to the west.

In modern angelology, Uriel is identified variously as a seraph, cherub, regent of the sun, flame of God, angel of the divine presence, presider over Tartarus/Hell, archangel of salvation, & in later scriptures, identified with Phanuel (“God has turned”). He’s often pictured carrying a book or a papyrus scroll representing wisdom. Uriel is a patron of the arts.

In the Eastern Orthodox churches, Uriel is commemorated together with the other archangels & angels with a feast day of the “Synaxis of the Archangel Michael & the Other Bodiless Powers” on November 8 of the liturgical calendar. For those churches which follow the Julian calendar, November 8 & falls on November 21 on the modern Gregorian calendar.

He’s regarded as the patron saint of the arts & sciences. In addition, every Monday throughout the year is dedicated to the angels.

The Anglicans & Coptic Christians of Ethiopia & Eritrea venerate archangel Uriel. According to the latter, July 11 is his feast day. In the Ethiopian Homily on the Archangel Uriel, he’s pictured as 1 of the great archangels & as the angelus interpres who has interpreted prophecies to Enoch & Ezra, & the helper of both of them.

According to the Homily, at the time of the crucifixion of Jesus, Uriel dipped his wing in the blood & water flowing from Christ’s flank & Filled a cup with it. Carrying the cup, he & the archangel Michael rushed into the world & sprinkled it all over Ethiopia.

In every place where a drop of blood fell, a church was built. Thus, Uriel is often pictured carrying a chalice filled with the blood of Christ in Ethiopian Orthodox iconography. Uriel is honored in the Lutheran Churches as well, with churches including statuary of the archangels Gabriel, Uriel, Michael, & Raphael.

At the Council of Rome of 745, Pope Zachary (intending to clarify the church’s teaching on angels & curbs a tendency toward angel worship) condemned obsession with angelic intervention & angelology. But reaffirmed the approval of the practice of the reverence of angels.

This Synod struck many angels’ names from the list of those eligible for veneration in the church of Rome, including Uriel. Only the reverence of the archangels is mentioned in the recognized Catholic canon of scriptures, namely, Michael, Gabriel, & Raphael, remained acceptable.

In the 16th century, Archangel Uriel appeared before the Sicilian friar Antonio Lo Duca & told him to build a church in the Termini area. Lo Duca told Pope Pius IV about the apparition, and the pope then asked Michelangelo to design the church, which became the Basilica of St. Mary of the Angels & of the Martyrs located at the Esedra Plaza.

In the 1st half of the 11th century, Bulgarian followers of the duelist heresy called Bogomilism, who lived in the dukedom of Ahtum in present-day Banat, invoked Uriel in rituals. This was witnessed by Gerard of Csanad, the Catholic bishop of the area after 1028. Uriel was also named in a small exorcism in the 15th century.

The Book of Enoch (which presents itself as written by Enoch) mentions Uriel in many of its component books. In chapter IX, part of “The Book of the Watchers” (2nd century BC), only 4 angels are named. Those angels are Michael, Uriel, Raphael, & Gabriel. Though some versions have a 5th angel: Suryal or Suriel.

However, chapter XX later lists 7 angels’ names & functions. Those angels are “Uriel, 1 of the holy angels, who’s over the world & over Tartarus,” Raphael, Raguel, Michael, Saraqael, Gabriel, & Remiel.

The Book of the Watchers tells us that Uriel, Raphael, & Gabriel were present before God to testify on behalf of humankind. They ask for divine intervention during the reign of the fallen Grigori (fallen watchers). These fallen ones took human wives & had half-“angel,” half-human offspring called the Nephilim.

Uriel was responsible for warning our boy Noah about the upcoming deluge. After judgment has been brought up on the Nephilim & the Fallen Ones, including the 2 main leaders, Samyaza & Azazel. Uriel then acts as a guide for Enoch for the rest of the Book of Watchers.

In the traditions & hagiography of the Episcopal & other Anglican churches, Uriel is mentioned as an archangel. He’s recognized as the patron saint of the sacrament of confirmation. In some Episcopal churches, Uriel is also regarded as the keeper of beauty & light, & regent of the sun & constellations.

In iconography, he’s shown holding in his right hand a Greek Ionic column, which symbolizes perfection in aesthetics & man-made beauty, and in his left hand is a staff topped with the sun. He is celebrated in the Anglican liturgical calendars of the Feast of the Archangels. The Church of St. Uriel the Archangel at Sea Girt, New Jersey, is a testimony to Anglicans’ devotion to Uriel.

In Hermetic Kabbalah, Uriel’s name is commonly spelled Auriel. He’s regarded as the archangel of the North, & of the element of Earth. According to the teaching of the modern Hermetic Order of the Golden Dawn, Uriel is the archangel of North & East, & is associated with the vegetation of the Earth. In iconography, he’s depicted holding stems of ripened wheat & wearing robes of citrine (a medium deep shade of golden yellow), russet (dark brown with a reddish-orange tinge), olive (like green olives), & black.

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DonateDonate monthlyDonate yearly #1028 #11thCentury #15thCentury #16thCentury #2ndCenturyBC #745 #Abraham #Adam #Aker #Angelology #Anglican #AntonioLoDuca #ApocalypseOfPeter #Apocryphal #ArchangelGabriel #ArchangelUriel #Arphugitonos #Auriel #Azazel #Azrael #Banat #BasilicaOfStMaryOfTheAngelsOfTheMartyrs #Beburos #Bogomilism #BookOfEnoch #Bulgaria #Cherub #Christian #Christianity #ChurchOfStUrielTheArchangel #Confirmation #Constellations #CopticOrthodoxChurch #CouncilOfRome #Deluge #EasternOrthodoxChurch #Eden #Egypt #Enoch #Episcopal #Eritrea #EsdrasIV #EsedraPlaza #Ethiopia #EthiopianOrthodoxChurch #Ezra #FallenOnes #FeastDay #FeastOfTheArchangels #FolkCatholicism #Friar #Gabuthelon #GardenOfEden #Genesis #GerardOfCsanad #Gnostic #GreekIonicColumn #GregorianCalendar #Grigori #Hell #HermeticKabbalah #HermeticOrderOfTheGoldenDawn #HolyFamily #HomilyOnTheArchangelUriel #Jeremiel #Jesus #JohnTheBaptist #Judaism #JulianCalendar #July11 #Kabbalah #KingHerod #LeonardoDaVinci #LifeOfAdamEve #Lutherians #MadonnaOfTheRocks #MassacreOfTheInnocence #Michael #Michelanglo #Nephilim #NewJersey #Noah #November21 #November8 #Nuriel #Oriel #Phanuel #PopePiusIV #PopeZachary #Prophet #Puruel #RabbinicJudaism #Raphael #RevelationOfEsdras #RussianOrthodox #Samyaza #Saraqael #Sariel #SeaGirt #SecondBookOfEsdras #SecretBookOfJohn #Seraph #Sicily #StElizabeth #SynaxisOfTheArchangelMichaelTheOtherBodilessPowers #Tartarus #Termini #TheBookOfTheWatchers #Urial #Uriel #Uryan #VirginOfTheRocks #Vretil #Vulgate #Yaldabaoth
Correggio e Leonardo

Today: Il 13enne che ha accoltellato la sua professoressa a scuola "voleva uccidere anche i suoi genitori"

Si sta lentamente riprendendo la professoressa Chiara Mocchi accoltellata mercoledì 25 marzo da un suo studente nella scuola "Leonardo da Vinci" di Trescore Balneario. Secondo quanto si è appreso il 13enne, dopo aver pianificato di uccidere la sua insegnante di francese, aveva comprato online il...

The 13-year-old who stabbed his teacher at school “wanted to kill his parents too.”

The professor Chiara Mocchi, who was stabbed on Wednesday, March 25th, by a student at the “Leonardo da Vinci” school in Trescore Balneario, is slowly recovering. According to what has been learned, the 13-year-old, after planning to kill his French teacher, had purchased online the...

#ChiaraMocchi #LeonardodaVinci #Trescore #French

https://www.today.it/cronaca/confessione-prof-accoltellata-scuola-chiara-mocchi.html

Il 13enne che ha accoltellato la sua professoressa a scuola "voleva uccidere anche i suoi genitori"

Nell'interrogatorio l'adolescente non si sarebbe detto pentito ma "deluso" dal non aver portato a termine il proprio intento omicida annunciato sui social

Today

“Lady with An Ermine” by Leonardo da Vinci

Here are a few facts about the painting "Lady with an Ermine": The "Lady with an Ermine" is a portrait of a young woman holding an ermine, a small mammal, and is believed to be a representation of Cecilia Gallerani, the mistress of Duke Ludovico Sforza of Milan. The painting is remarkable for its delicate sfumato technique, which creates a soft, hazy effect by layering thin glazes of paint. It is considered one of Leonardo's most beautiful and intimate portraits. This is how the ZaxiousXL […]

https://ai.forfun.su/2026/03/28/lady-with-an-ermine-by-leonardo-da-vinci-2/

#datocurioso

¿Sabían que Leonardo da Vinci fue acusado formalmente de nigromante ante el Papa León X, lo que detuvo sus investigaciones anatómicas en el Hospital del Santo Espíritu en Roma hacia el año 1515?

La obsesión de Leonardo por alcanzar la máxima precisión técnica en sus pinturas y tratados científicos lo llevó a diseccionar más de 30 cadáveres a lo largo de su vida. En una época donde el clero ejercía un control estricto sobre los cuerpos, esta práctica era vista con sospecha extrema como "un acto profano, impuro, oscuro y con tintes diabólicos."

Un ayudante alemán de Leonardo, llamado Giovanni degli Specchi, aprovechó este clima de desconfianza para denunciarlo por prácticas de "nigromancia" y "hechicería" ante las autoridades eclesiásticas.

La acusación no se basaba en la invocación de espíritus, sino en la manipulación física de los muertos, algo que la doctrina religiosa de entonces distorsionaba para difamar a los investigadores. Debido a estas denuncias y al estigma social de "profanador", el Papa le prohibió continuar con sus disecciones en el hospital, obligando a Leonardo a abandonar gran parte de sus estudios sobre el sistema cardiovascular y la embriología. En su tiempo su curiosidad científica y sus apuntes fueron etiquetados como una práctica oscura y prohibida que puso en riesgo su libertad y su legado.

#LeonardoDaVinci #Historia #Ciencia #Anatomía #Renacimiento #Nigromancia #magia #magi

RaiNews: La preside della scuola dove il 13enne ha accoltellato la docente: "Tutti provati, vicini alla prof"

"Le vittime sono due, la docente e un minore di 13 anni" dice la dirigente scolastica della "Leonardo da Vinci" di Trescore Balneario, in provincia di Bergamo, teatro dell'aggressione di ieri

The headmistress of the school where the 13-year-old stabbed the teacher: “Everyone was shaken, close to tears.”

“The victims are two, the teacher and a minor under the age of 13,” says the principal of the “Leonardo da Vinci” school in Trescore Balneario, in the province of Bergamo, the scene of yesterday’s attack.

#LeonardodaVinci #Trescore #Bergamo

https://www.rainews.it/video/2026/03/la-preside-della-scuola-dove-il-13enne-ha-accoltellato-la-docente-tutti-provati-vicini-alla-prof-89a6d562-f8ef-4903-9a1e-c811cb772a76.html

La preside della scuola dove il 13enne ha accoltellato la docente: "Tutti provati, vicini alla prof"

"Le vittime sono due, la docente e un minore di 13 anni" dice la dirigente scolastica della "Leonardo da Vinci" di Trescore Balneario, in provincia di Bergamo, teatro dell'aggressione di ieri

RaiNews

RaiNews: I genitori: "La docente accoltellata è sotto intervento, il ragazzo è qua, andrà aiutato pure lui"

Paura fra i familiari degli alunni della scuola Leonardo Da Vinci dopo che una professoressa è stata ferita da uno studente

The parents: "The teacher who was stabbed is under treatment, the boy is here, he will also need to be helped."

Fear among the students of Leonardo Da Vinci school after a teacher was injured by a student.

#LeonardoDaVinci

https://www.rainews.it/video/2026/03/bergamo-trescore-balneario-docente-accoltellata-le-voci-dei-genitori-degli-allievi-f8959195-0cb8-4f28-a57b-82649cc55fab.html

I genitori: "La docente accoltellata è sotto intervento, il ragazzo è qua, andrà aiutato pure lui"

Paura fra i familiari degli alunni della scuola Leonardo Da Vinci dopo che una professoressa è stata ferita da uno studente

RaiNews

One can have no smaller or greater mastery than mastery of oneself.
-- Leonardo da Vinci

#Wisdom #Quotes #LeonardodaVinci #SelfMastery

#Photography #Panorama #ChacoCanyon #Sunset #NewMexico