Spirographs belong to a family of curves known as hypotrochoids.
They are beautiful in their simplicity and variety. Many of you may have had a Spirograph set as a child.
Here I include images I have generated using parameteric equations (math) as well as images that are reminiscent of those created with the childhood toy.
Click on a thumbnail for a larger view. Many of these images may be purchased.
3-Weave
SA-116
SA-116
Pinwheel Panoply
SIDX-94
SIDX-94
Prismatic Duo
SIDU-91
SIDU-91
Spirography
SIDT-90
SIDT-90