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December 14, 2019 Meeting Notes

The December meeting was hosted by Scott Vorthmann. As usual for meetings hosted by Scott, the meeting started off with people socializing and working on a Zometool build. This time, the model in question was a vertex centered projection of a 120-cell. Unlike the cell centered Zometool 120-cell model, this model requires a great number of specialty 3D printed pieces. We were unable to complete the model in the time allotted, but Scott finished it the next day and you can see the completed model below.


There were three talks at the meeting.

Marc Roth spoke on Pascal’s triangle designs and showcased 2 quilts made by Elaine Krajenke Ellison using his Pascal’s triangle designs.



He also shared a Pascal’s triangle mod-10 playing card puzzle, and brought puzzles for everybody to try.

Roger Antonsen spoke about his experience at the ICERM Illustrating Mathematics semester workshop. He shared his semesters worth of concentrated math art work there. This included visualizing card shuffling, various methods of circle packing, a laser cut Hilbert curve Celtic knot, a laser labyrinth mirror Hilbert curve, using tiles to make a Hilbert curve (3 different tiles required), visualizing peg solitaire games, and a beaded cellular automata project that he worked on with Gwen Fisher. On top of all that he also quickly showed assorted works in progress that came out of the ICERM semester workshop.

Lastly, Jeffrey Ventrella gave a Bridges talk rehash on his work on “Portraits from the family tree of plane filling curves“. You can see more of his space filling fractal curves work at his website: or