Also, is it my imagination or an optical illusion ... that looks like it is in the middle of the top landing of a stairway, right where WC Jerry's referenced person will step on it.
Even a 110 lady in spike heels will poke that thing out, heck, even a man in large flat heels like are on men's shoes will crush that thing.
Not only that, but if on the landing as it looks, it is now a trip, slip and fall hazard as the surface is no longer level.