Before kids, I spent much of my life labeling things.  As a biologist I was trained in the science of naming (taxonomy) and spent countless hours looking through a microscope at all kinds of invertebrates.  Each animal was labeled with a name and classified into groups.  When something is labeled, we know how it relates to the rest of the world, we know how it will behave, we know what to expect.  At least we think we do.