Ethnomusicologist Dr. Verna Gillis (previously an assistant professor at Brooklyn College and Carnegie Mellon University, US), has just recently been granted a US design patent for her ‘Ball’. (Jan. 7th, 2014)
More accurately named as the Kick Butt Ball™, which is described as “… a novel spin on a stress ball, with one side shaped like bulbous buttocks!”
Here she is performing a musical rendition of the Kick Butt Ball™ advertising promo.
Available here ($5.99 each plus shipping)
Also see: Ball squeezing and creativity