(Photos: Mathery Studio)
These things apparently don’t come in adult sizes, which is totally unfair because I would use them. The design firm Mathery Studio created an area in the National Gallery of Victoria where kids can get creative. They made helmets and sandals with built-in crayon balls. Kids strap them on and mark up the walls, floors, and furniture.
To my knowledge, these devices are not yet commercially available, but I can imagine a big market for them. Probably not for the home, though.