Artwork by Adrian. His description, as far as I can recall it:

This is a rope between two mountains. You cycle on the rope between the mountain tops. The rope is tied with strong knots so it won’t come loose.

You have to be careful not to fall off, because the orange thing below the rope is lava. And underneath the lava, if you fall past the lava, you end up in green slime [mostly hidden behind the masking tape] and you don’t want that.

So it’s quite dangerous and only for adults, kids can’t do this.