Intelligent Design is the slightly provocative title of a small, overpriced book I wrote, containing black and white graphics that show simple geometric phenomena, with explanations.
The constraint for the design was that it had to be cut out by a die cutter. I had acquired a Silhouette Cameo which can import AutoCAD dxf files and cut these very accurately (from card stock, for instance). One can then use these cutouts as window art.
The process puts interesting constraints on the graphics. It needs to be connected (otherwise it will just fall apart), simple, and simultaneously intricate.
Under these constraints, one can still achieve a modest 3D effect by thickening parts that should be close to the viewer.
This is a 7-4 torus knot. Look at it from some distance.
The Inner Frame 