Around 2008 I became interested in the moire effect and interactive patterns.
I began to make and test patterns I liked the circular format because the effect repeats.
This led to the a product idea, The Moire Drink Coaster.
US Patents: 7954264 & D74292
A moire effect is created when two circular patterns rotate one against the other.
Circular revolving patterns to create a feeling of spatial disorientation
"... a deep tranquil space for the introspective drinker"

Licensed to Kikkerland Design in NY
Two sets of Moire Drink Coasters were manufactured, distributed world wide

Kikkerland Production Packaging
bw coasters

My further exploration of circular moire patterns and be found on

my Tumblr page where 300+ additional experimental patterns
are viewable as animited GIF files