If something is in the sky, is it part of the sky?
How far does the sky go? What is behind it?
What can fall out of the sky? What can rise up into it?
How would a bird, a dog, or a watermelon describe the sky?
Where does the sky stop and the earth start? Is there anything in between?
Fill a page with thoughts about the sky.
Give your work a title. Put your signature on it, too, and write the date.