Aut cum scuto aut in scuto
7 foot in diameter? Shades of " The Prisoner"I bet dogs would love the little ones; "hey, look, a ball that plays back"
Undoubtedly, it will be on sale in the Hammacher Schlemmer catalogue soon.
In Heinlein's "Friday" there were "Public Eyes", but they floated on antigravity devices.
1. We've already seen this in The Incredibles: https://dov5cor25da49.cloudfront.net/products/6110/636x460design_01.jpg2. How kickable are the small ones, and are they bulletproof? Just asking.