There has been an experiment with smaller children. First, there was a smaller container which had a certain amount of liquid (Let's say 355 mL, the same as a coke can). Then, there was a taller glass, with the same amount. Without saying which had more, they were asked which one had more liquid in it. They chose the taller glass. There was also some experiment where they had to guess which one had more liquid, and then had to pour it from one size glass to another. I forgot the experiment exactly, but I still feel this way with certain things. Why? For example, Jones Co Soda (The best soda company in the world, in my opinion) makes glass bottles, 355 mL each, with a resealable lid. Now, coke cans have the same amount of liquid. Yet I swear, it seems like the Jones Co ones have more. Is this because of the illusion that it being taller it has more liquid?