Ethan Schlussler And His Ingenious Bicycle Powered Treehouse Elevator...

Firstly Ethan Schlussler from Sandpoint Idaho built his wonderful treehouse.
About thirty feet above the ground.
Then he says without wishing to exaggerate, he got tired with climbing up and down a ladder six and a half million times a day to access his delightful but not completed treehouse.
Knowing all about necessity being the mother of invention, he came up with this novel way of solving the problem.
You can see how it works here.
Personally I'd have used another method but Ethan being a fan of Frank Sinatra simply said,
I did it my way...