GravityElevator: A Sand-Based Elevator Machine

This is one of my old gadgets that I made. It is an elevator that is based on sand. It only takes you down floors, though. It is operated with 3 levers, one to spawn sand to place in the elevator shaft, and the others to remove the sand. It takes sand from a hole that protrudes from the top, and arranges it into a vertical column. Then a piston on the bottom pushes the sand into a void hole, making the sand level drop slowly down. It is hard to use, and can be dangerous in some cases, but I still find this elevator quite neat.