Hello everyone, I've decided to make crossover between a rolling ball sculpture and an hourglass. Here's the result so far: It's designed so that the ball can be replaced with a different one - from a different material and/or color. The whole thing is about 8cm in height and 6cm in diameter and the orb to be used has to be from 1cm to 1,1cm in diameter. It is almost complete. One thing I still can't decide how to design is a system to close off the opening for the ball, so that it doesn't fall out while you flip it. What do you think?