Right now, I feel that's the size of my brain.
I need, for comparison, something that is the size/shape of a walnut that kids (5-8) would easily know. Ping-pong/golf balls are double the size of a walnut, even if kids knew what they were. The base of a chocolate kiss is the size of a walnut, but it isn't round. I'm about ready to hit the bottle over this, so I thought, hmmmm, rum balls!...which, course, I can't use.
Walnuts are a smidge bigger than 3/4".
It doesn't matter what it is--a food, a toy, something in/on a car, something common in classrooms....
If something comes to me after I hit "send," I really am going for the bottle. It seems likely, though, I'll hit it if doesn't, too.

Any donation you can make to stop this self-abuse is appreciated.