How about this:
Slate is a cube, once you walk off that cube you fall, so to some people that is like still walking due to not seeing where the ground is, which there isnt making an allusion that you are walking constently (or infinity) when, your just falling. Also the falling is a loop, If you could some how color slate to some seeing color and if you fell off the side, you would be able to see slate as many times as you can see your screen, meaning slate has a hidden teleport under the whole thing meaning if you fall, you teleport really high up, and fall some more, yet when you fall you fall away from the cube, so theres really no way back alive.
Also to get to the end of slate, get the save blocks: winter land, then just drive to where you see the very and, then you look around for the end and you will find it. I fell off it on the path leading straight into the palace.