The Virtusphere is a 10-foot hollow sphere housed on a special platform that is covered in wheels, allowing encased players to walk, run and roll around in a virtual environment viewed entirely through a wireless headset, sort of like that time you taped a Scooby Doo viewmaster to your face when you were nine and ran around in your backyard pretending you were in the Mystery Machine.
This is what fun used to look like.
While we fully support massive unwieldy devices constructed purely for entertainment, a gigantic metal ball noisily grinding around on castor wheels isn't going to fit inside most people's living rooms (you'd have trouble fitting the damn thing in a high school gymnasium).
Even if your house had a big enough room to fit this expensive monstrosity in it, if just one wheel slips you're going to go crashing through the wall trapped inside a hollow boulder like the opening scene of Raiders of the Lost Ark.
Or like a pitcher full of sugar water.