The House of small cubes is a 12 minute movie I found while browsing Netflix. The protagonist lives in a house tower on a planet where the sea levels have risen. He has to continue building onto his house to keep safe from flooding. One day he accidentally drops his pipe into one of the lower levels of his home. He buys scuba gear in order to retrieve it. As he continues down to the lower levels, memories come flooding back of the time when each level of his home was the top level. It's sort of a depressing film but at 12 minutes long you can't go wrong.