If you're looking for visual interest in a custom motorcycle, the RK Concepts Bearing Cycle offers a lot of it. I noticed this bike for sale and can't remember seeing it before, though it's not the type of build I usually follow so that's not surprising, but it's kinda neat. The entire center frame of the bike is a large diameter functional ball bearing and the suspension is based on the movement of the bearing, controlled by a single shock mounted horizontally on top. Hmm ...
The engine comes from a Honda CR500. The wheels themselves have large diameter bearings in the center with perimeter disk brakes. The front suspension seems to be mounted to the outside bearing race and the rear is mounted to the inside race.
Does the suspension travel in an arc? Does the wheelbase change as it moves? Does ride height change? I didn't find a video anywhere to show it in action so your guess is as good as mine unless you've seen it and can shed some light.
The bike is certainly not practical, the seat I'm not even going to mention, but you have to give the builder, Rafik Kaissi, high marks for originality. Interesting.
Link: Bearing Cycle on eBay