I bought one at first, but it was always getting lost - and he would cry for me to find it...
I cancelled lunch with a friend because he was so upset that I couldn't find it. I rescheduled for the next day, but I don't think she was impressed. Sometimes I have to explain to friends:
I'm in mummy mode today...
Anyway - I bought a dozen of the balls and that solved the problem.
My knees got sore from bending to pick them up every day, so I bought a picker-upperer gadget which I use to pick up all his toys. It's a godsend...
Seriously though - having an indoor cat (and an 'only' cat) means I take enrichment activities very seriously. Especially since he used to have an outdoor enclosure and we live in a flat now...
My phone is crap, and doesn't take good photos or videos, but I would rather spend my money on Hills Science Diet and exciting new toys. I recently transitioned him to Hills Perfect Digestion Adult 7+. I can't believe my baby is over 7 years old now...