MIT's Robosnail can now climb the walls and even traverse upside-down on the ceiling! The new slime the robosnail uses is Laponite. With five feet sliding through the Laponite one by one and once all the feet have moved forward the Robosnail itself inches its way forward. The engineers first tried an incline and the Robosnail inched forward with no problem, so they tried sticking it on the ceiling and there again, no problem. They can't make the robosnail too heavy or it will fall from the ceiling. It seems their limit for keeping it on the ceiling is up to 31.6 grams.