Links, quotes, reblogs and more that don't quite fit on the main blog but are worth remembering. And a looooot of GeoGebra.
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Cubes with string art.
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Blue and green wave. Ballpoint 10x8” A4
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Mark Hamill at the Museum of Mathematics
That is all.
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James Thrall Soby (photograph), Alexander Calder with 'Steel Fish', Roxbury, CT, 1934 [© Calder Foundation, New York, NY / ARS, New York]
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Ghee Beom Kim Spiral
Saw this one from GBK via @xwva and had to make it. Play in GeoGebra. He's been doing lots of interesting dissections of regular polygons.
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Another classic Ghee Beom Kim spiral.

(via (6) Facebook)
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(via Piastrelle Zellige in Trapeze Design | MOSAIC FACTORY)
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Max Bill, Homage to Picasso (Hommage à Picasso) from Homage to Picasso (Hommage à Picasso), (lithograph), Propyläen-Verlag, Berlin, 1972, published 1973, Printed by Erker-Presse, St. Gallen, Edition of 30 [MoMA, New York, NY. © Estate of Max Bill / ARS, New York / ProLitteris, Zürich]
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Sophie Taeuber-Arp (1889-1943) [Switzerland] — ‘Equilibre’, 1931. Oil on canvas (32 x 25,5 cm).
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200625. Sensory Processing.
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Happy Pride Month! I designed this holographic geometric Pride realness entirely in Figma.
20% of proceeds from all of my Etsy and Ko-fi sales are donated to 2SLGBTQIA+ mutual aid annually on December 1.
Snatch this sticker on my Etsy: Holographic Inclusive Pride Cube Sticker
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Cretan Coin ca 300 BCE
Hera on the obverse. Via Chapps on Bluesky.
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Spiral maze used in psychological testing. Psychological monographs. 1910.
Internet Archive
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Odili Donald Odita
Mid-Day, 2025
Acrylic on canvas
60 1/4 × 48 1/8 × 1 1/2 in | 153 × 122.2 × 3.8
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Golden Ratio Decagon Spiral
Another beauty from Ghee Bom Kim in the Mathematical Tiling FB group. Pentagons cutting the golden obtuse triangles into two golden acute triangles is egregiously clever. Then he adds...
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32 parts, check. 44 colors? Maybe 4 colors?

Max Bill, Field of 32 Parts in 44 Colors, 1965
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