A somewhat older desk or work chair. We know many variations of this. Nature  saddles us now and then with aberrations where something has gone wrong in the cell division. A sheep with five legs, a calf with two heads or of course Siamese twins are clear examples of this. When you design and make something with your full mind, these kinds of ‘mistakes’ of course no longer occur. As a thought experiment and certainly also as a form it can be interesting or even challenging. The seat is already rising.