Hélio Oiticica
Got to see an awesome exhibit at the Art Institute of Chicago this week featuring Brazilian artist Hélio Oiticica, and a companion exhibit on post 1950 Latin American art on paper. Several of the images were lovely natural arrays of rectangles... so I had to play in GeoGebra.
Exhibits: To Organize Delirium & Abstract Experiments
In this one, you can control all the dimensions. In the other they are evenly divided.