a finger pointing

I am a finger pointing at the moon Don't look at me - look at the moon. The finger is needed to know where to look for the moon, but if you mistake the finger for the moon itself, you will never know.

But... The light of the moon shines on all fingers, even the ones pointing in the wrong direction.

And... There is a dark side of the moon at which no finger can point.

Also... At least half of the time, we can't point to the moon at all. But other people can.