Another successful meeting of the Bay Area Mathematical Artists took place yesterday at the University of San Francisco! It was our largest group yet — seventeen participants, include three new faces. We’re gathering momentum….

Like last time, we began with a social half hour from 3:00–3:30. This gave people plenty of time to make their way to campus. I didn’t have the pleasure of participating, since the campus buildings require a card swipe on the weekends; I waited by the front door to let people in. But I did get to chat with everyone as they arrived.

We had a full agenda — four presenters took us right up to 5:00. The first speaker was Frank A. Farris of Santa Clara University, who gave a talk entitled *Fibonacci Wallpaper Spirals.*

He took inspiration from John Edmark’s talk on spirals at Bridges 2017 in Waterloo, which I wrote about in my blog last August (click here to read more). But Frank’s approach is rather different, since he works with functions in the complex plane.

He didn’t dive deeply into the mathematics in his talk, but he did want to let us know that he worked with students at Bowdoin College to create open-source software which will allow anyone to create amazing wallpaper patterns. You can download the software here.

Where do the Fibonacci numbers come in? Frank used the usual definition for the Fibonacci numbers, but used initial values which involved complex numbers instead of integers. This allowed him to create some unusually striking images. For more details, feel free to contact him at ffarris@scu.edu.

*My Experience of Learning Math & Digital Art*, given by Sepid Ebrahimi. Sepid is a student in my Mathematics and Digital Art course; she is a computer science major and is really enjoying learning to code in Processing.

*Conics from Polygons: the Chord Ratio Construction*, was given by Scott Vorthmann. He is spreading the word about vZome, an open-source virtual environment where you can play with Zometools.

*r.*Now add a chord parallel to the second segment and

*r*times as long — this gives the thick green segment at

*y*= 1. Connect the dots to create the third segment, the thin green segment sloping up to the right at

*x*= 1. Now iterate — take the second and third segments, draw a chord parallel to the second segment and

*r*times as long (which is not shown in the figure), and connect the dots to form the fourth segment (the thin green segment sloping to the left).

*Infinite Polyhedra Experiments with Planet’s Satellite Imagery.*

*entire*polyhedron, you’ve got to stop somewhere. This means that you can actually see

*both*sides of all the faces in this particular model. This adds a further dimension to artistic creativity. Feel free to contact Stacy at cubesandthings@gmail.com for more information!