It's Knot Art
I often work with artist and animator Pete McPartlan.
Most recently he has done some great stuff on Numberphile's knots series.
Inspired by his work on the videos, Pete also created some works of art.
Coincidentally, he used the cyanotype method recently featured on Objectivity.
I also found it interesting (and mildly horrifying) that he created the artworks on the backside of other Numberphile artworks from previous videos!
See the photo gallery below for all the cyanotype images and what was on the back of each!
The artwork is based on the number of "unique" knots for each crossing number, as featured in the first video of our knot series.
Seven of the artworks have been sent to Numberphile's "Prime Supporters" on Patreon.
I am keeping the rest for my own Numberphile art collection!