An artist from USA with nickname max13124 rendered some impossible figures by other artists. There are "Window in the floor" and "Follow the groove" by Oscar Reutersvärd impossible cube Dirk Huizer among of them.
See also rendered Escher's "Belvedere" by max13124.
Artist's deviantART profile http://max13124.deviantart.com
Window in the floor
Follow the groove