🚀 go-pugleaf

In article <106207@bu.edu>, tvaughan@buphyk.bu.edu (Timothy Vaughan) writes:
>I just thought of a non-circular shape that won't fall through.
>I don't know what it is called, but it is the shape of the rotor
>in a Wankel engine.  It has constant diameter, although not
>constant radius.  It could be described nonrigorously as a "rounded
>triangle."  I will try to derive the equation for it.

As someone has pointed out, the height of a triangle is smaller than
the base length, it is possible for it to fall through close to the
base.  But make it concave in like star-shape would work.  All
odd-pointed star shapes would not fall through.  (Pretty hard to climb
through.)