Lewis Carrol , mathematician , photographer and writer , best known as the author of Alice in Wonderland and in its variant mathematical work and studies within the branch of recreational mathematics.
One of his best known puzzles is the " monkey puzzle "



Portada acertijo del mono de Lewis Carroll 


In a simple frictionless pulley hangs a monkey on one side and the other a weight that perfectly balances the monkey.
To be totally purist in solving the puzzle , it is considered that the rope has no weight or friction.
What if the monkey tries to climb the rope?