Gustave Doré probably spotted that hidden head many years before I found it.

Segments from:
※ Left: Illustration Plate I (mirror view) by #GustaveDoré to chapter 1 in #MiguelDeCervantes’ #DonQuixote, 1863 edition.
※ Right: "Temptation of St Anthony" by #MatthiasGrünewald (c. between 1512 and 1516, a panel of the #IsenheimAltarpiece, now located at #MuseéUnterlinden, Colmar, France).

https://snrk.de/monstrous-heads/

#MatthiasGruenewald #TemptationOfStAnthony #HiddenImages #GustaveDoré #pareidolia