Depending on whether or not you deal with obsessive compulsive tendencies, Odoardo Fioravanti's Inbolla can either be considered art or pure torture. Only 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—that's also an option. If you don't suffer from OCD, trust me, this is the most cruel $23 gift you can give someone dealing with the condition.