How many Post-It notes make a 50 mile walk

Continuing my workings to create the Mungo Spiral, I had to work out how many sections of wood I would need to a) Create a good sized spiral and b) Create enough room for people to walk into it.

The answer lay in Post-It notes. Each note is 7.5cm square, which is a good size for the wood. I could use 7.5cm fence posts for this purpose. Each Post-It therefore represents one wooden post in the spiral, and laying them out like this tells me that 200 posts would create a good spiral.