Federgraph is a function plotter app to visualize a special built in function z = f(x, y) in 3D. The physical model behind the app is a system of springs.
The built in function produces a variety of colorful pictures, some of which appear to have a face.
Changing the parameters of the physical model will trigger a recalculation of the image.
The defining text of an image can be exported to the clipboard for use in the desktop application. All images you create can be reproduced from a few lines of sharable text data.