I wrote a program called FlowPaint some years ago on my old Mac IIsi. The predecessor of FlowPaint was a program called Concentricircles, the first graphical program I ever wrote (on our old 128K Mac, upgraded to 512K, with a Pascal interpreter). Today I implemented Concentricircles in a demo version of RealBasic. It was nice to see these images again. I like how interactive and simple the tool is to play with, and I like the Moire patterns you can make with it. I showed it to Portia and she made an image too.
