This is a water wheel mill for when back then you converted the water you created from the wheel into electricity. I built this because I haven't used any working functions in my builds for Lego Ideas. I think that this would be cool on a display shelf for collectors to have. The water wheel mill features one main function where you turn the knob to the left on the back of the build in order to rotate the water wheel. Also, if you wish, you could use some of the Lego electronic functions to spin the wheel.