The cup with the funny bit in the middle is a Pythagorean Cup – 3D printed – 13 hours and 160 gramme of filament.

A Pythagorean Cup is a weird beasty – it prevents piggy drinkers.  If you fill up the cup to below the line on the rim (below the top of the domed piece in the middle) then you can drink from the cup, no problem.  If you fill the cup to above the line, then a siphon (which is within the domed piece in the middle) will empty the cup through a hole in the base all over your lap.