Oloid

An oloid is a three-dimensional curved geometric object that was discovered by Paul Schatz in 1929. It is the convex hull of a skeletal frame made by placing two linked congruent circles in perpendicular planes, so that the center of each circle lies on the edge of the other circle. The distance between the circle centers equals the radius of the circles. (source wikipedia)

Once started with mathematical design, i searched the internet for some more math's.... this is one of the first things I found.

I like to see it wobble it's way wen you push it.