KISS principle

"It seems that perfection is reached not when there is nothing left to add, but when there is nothing left to take away" its said by  Antoine de Saint Exupéry. 
KISS is an acronym for "Keep it simple, stupid" as a design principle noted by the U.S. Navy in 1960. 

It is idea of famous air craft engineer Kelly Johnson. It is also modified, "keep it short and simple"

The KISS principle states that most systems work best if they are kept simple rather than made complicated; therefore simplicity should be a key goal in design. 
The Disney's famous animators said that, when they were new, they made lot's of mistake. But one thing was commonest among all, THEY OVER DID IT. Their character was over moving , over done. The soft ware programmers also follows the same formula" YAGNI" you aren't gonna need it.