That got a chuckle out of the colt. "No, it's not like that at all. Maybe it's not the best name, but Ray Casting, as described by Bearapple, is the idea that we can't observe anything directly; we can only observe stuff by bouncing something off of it." He tapped his hoof on the dining table. "Like, when we look at this, we're not directly observing the wooden table, because the table isn't actually doing anything itself. His proposal was that we are really just seeing the sunlight coming in from the window and bouncing off of it."