If you were to hear the phrase "glass floor," you'd probably picture something like this, right? Like a glass-bottomed boat, except that you're actually inside, and you're not sitting next to someone's seasick cousin, and you mostly just have a view of your downstairs neighbor's mismatched furniture and it's kind of awkward to see them hanging out all of the time, especially when you catch them looking at the bottom of your feet or the loose change and dust bunnies under your couch. In fact, it sounded cool at first but now it doesn't seem like a very good idea at all.
But wait: you assumed that by "glass floor," I meant "clear floor," which isn't necessarily the case. Indeed, a new flooring product from Germany's ASB Systembau GMBH boasts a semi-opaque ceramic finish to the effect that "the floor does not reflect too much to be a distraction but still gives a slight reflection which compares to the effect marble has on the eye." Billed as "the most advanced flooring system in the world," the ASB GlassFloor is a system in which reinforced glass panels are set on an aluminum substructure that can be embedded with lighting elements.