To extend it, the "genius or insane?" trope comes from both being pretty much defined as to be indexed on things others can't see. The main difference is, geniu

To extend it, the "genius or insane?" trope comes from both being pretty much defined as to be indexed on things others can't see. The main difference is, genius reveals things that we realize afterward were always there, and insanity is mostly failing to cohere the perspective into something others can see as well. Brain is also made to represent what a child imagines as "smart." Pinky as the genius does make the cartoon adventures more rich though.