I have a "big" problem to make my city more beautiful. I would like to have lapms which are underground (covered with grass), but at night it goes up without the grass ot its top. I could do the detector thing, my only problem is to change the blocks, raise the different types of block to different heights with only one lever. If someone could help me I would be very happy. I'm trying to solve this for about 3-4 hours now, so please help me!!!