The conversation on the walk to school to pick up the girls.
The Boy: Why does the sun move?
Me: The sun looks like it's moving because the earth is spinning.
The Boy: Ah ... (Puzzled look)
This is followed by a quick demonstration where he is the sun and I spin around being the earth day...night...day...night...
The Boy: Is our world spinning around.
Me: Yes like a little ball spinning around in big space.
The Boy: Is our world on a speck (Horton Hears a Who reference) because specks spin around.
Me: Yes just like that.
The Boy: Ah, our world's on a speck (skip)
and a photo: It Rained Today