Hypersphere Muscle Relaxing High-Intensity Vibrating Message Ball Screenshots View ImageView Image Hunter's comment Hypersphere is a less painfully vibrating message ball that helps your muscles to activate,

Hyperspheres are spheres in a dimension N, greater than 3. In two dimensions we have a circle, in 3 dimensions we have our first sphere. It is very hard for us to visualize spheres in larger dimensions,