In February 2024, I attended the Gathering 4 Gardner in Atlanta (G4G15), which has a tradition of a gift exchange, where you bring 170 copies of a small gift, and in turn you get a small gift from all of the exchange participants.
One of these gifts, a set of 3D-printed fractals from Hideki Tsuiki appeared recently in the Numberphile video on the right—I have copies of these fractals in my office!
My G4G15 gift
For my G4G15 gift, I made 200 distinct cards illustrating “parity triangles” of OEIS sequences, based on the idea in my blog post “Parity Bitmaps from the OEIS.”
Here’s how the cards turned out:
I used a Cricut to cut out the shapes of the cards, and then I draw them using an AxiDraw V3 pen plotter.
I then wrote a Python script that downloaded the data from the OEIS and generated SVG instructions for drawing the cards.
Here’s a video (sped up by a factor of 10x) showing the AxiDraw V3 pen plotter dutifully following the instructions.
Send me a message on Bluesky @peterkagey.com if you want me to put one in the mail for you!
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