Oooh, this one turned out nice!

#solargraphy image:
This is the course of the sun over the last 6 months in Lilienthal, close to Bremen, Germany. The picture was taken with a can (with a tiny hole) and photo paper.

@moritz was the photopaper in the can?
@eliza_coli yes! This is how it works: https://www.instructables.com/Solargraphy/ (I use screw top cans though for reusability..)
Solargraphy

Solargraphy: Solargraphy is the art of long exposure photography that captures of the image of the sun moving across the sky.  These exposures can last days, months, even years. This Instructable will show you one design for solargraphy pinhole cameras. &nb…

Instructables

@moritz @eliza_coli Very nice, Moritz! From solstice to solstice? 😉​ Also cool to see they're giving Justin Quinell credit for the approach — here's also an interesting talk by him at Hong Kong Photo Festival 2017:

https://www.youtube.com/watch?v=elFhASvX5Ck

Justin Quinnell|Aristotle’s Hole - From Mo Tzu to the Selfie Stick 阿里士多德之孔 — 由墨子到自拍棍

YouTube
@toxi @eliza_coli yes, I repeat every six months for a clean shot 😀 and thanks for the link!
@moritz @eliza_coli @toxi Many pioneers indeed. First encountered it through the work of Finnish artist Tarja Trygg: http://www.solargraphy.com
SolargraphyGallery - Welcome to Tarja Trygg's website of The Global Project Of Solargraphy!

Solargraphygallery page, solargraphy, solarigrafia