I'm learning about Schrodinger's equation in my general chem class right now, so obviously I'm doing a little background reading on quantum theory. The following is an excerpt from a supplement on basic (very basic) quantum theory: The answer is that quantization is only noticeable when studying really small (microscopic) things, like an atom or an electron; it is hidden (although not absent) in large (macroscopic) things, like a baseball or a person. I'm curious as to what types of quantization occur in the macroscopic world. I'm guessing it's not going to be something obvious, like motion. Does anyone have any insight as to what exactly is meant by quantization in the macroscopic world, or could you provide a reasonably nontechnical example? Thanks in advance for all responses.