The Clever Visual Metaphor for the Abstract Concept of Thought are visual metaphors used to personify the abstract concept of thought in SpongeBob's mind.
They all look very similar to each other, except for the "boss" who wears a green visor. Other than this, they look like many smaller SpongeBobs who are hard at work.
They are seen in the episode "Squilliam Returns." They are forced to empty everything in SpongeBob's mind, except for fine dining and breathing. Among the things that are seen being thrown out were jellyfishing, childhood memories, spice garden tips, and math.
The "boss" of the other SpongeBobs wears a green visor. He hears a SpongeBob talk about how they do not exist and the SpongeBob that the boss threatens to fire begs and claims he has three kids. They all work in the brain office.