Depending on whether or not you deal with obsessive compulsive tendencies, Odoardo Fioravanti’s Inbolla can either be art or pure torture. Either the spirit level on top or the image of the water can be perfectly horizontal — never both at the same time.
You can try straightening the portrait all you want, but you’ll have to eventually learn to settle for one of the elements always being crooked — unless you find a way to warp the space-time continuum so they both appear level. If you don’t suffer from OCD tendencies, trust me when I say that this is the most cruel $US23 gift you can give someone who does have the condition.