Illusion is..

..when you see these adorable minuscule nymphs, just hatched and staying together like one big happy family...

.and then, before you know it...

...they have become adults and you will be chasing them around your home, hoping they will not emit the pungent cilantro-like odor through holes in their abdomen..a trait that evolved millions of years ago to prevent them from being eaten by a predator, but which comes in very handy when they want to be left alone in one of those warm houses where they like to overwinter!