now, he said, giving me an orange, first tell me which hand you have got that in.

the right, I said. Now, he said, go and stand before that glass, and tell me which hand the little boy you see there has got it in. After some perplexed contemplation, I said, the left hand. exactly, he said, and how do you explain that? I couldn't explain it, but seeing that some solution was expected, I ventured, if I was on the other side of the glass, wouldn't the orange still be in my right hand?

I can remember his laugh... well done, little boy, he said. the best answer I've had yet.