It's a little sphere on which light falls from all around, in three dimensions.

And look at the way those little spheres are nested one inside the other!

I didn't know or care what was beyond my little sphere.

They shot a little sphere into the back of her neck and she died.

Then the little sphere shattered on the stone at his feet.

He held out a container full of little brown spheres.

We may run into some more of those little spheres, though, and I don't like the prospect.

Each servant, moving in and out, covered a little sphere of his own.

It had a little light sphere on it and would tell them whether anyone was standing outside.

He took the little sphere in both hands and twisted it slightly.