Interlock - Musings

I had received requests to not post the design group's sketchbooks when I initially posted the Tuesday Teaser, but to do it later in the week. Well, later in the week for INTERLOCK has turned into Monday. This might work out.
Below are a few sketchbook results:

An artist that immediately came to my mind when I thought about interlock was M.C. Escher.
The master of symmetry. Who do you think of?