The Moss Observatory and the Watering Comet
On the balcony of apartment 4B sat a clay flowerpot, and in the pot grew a thick cushion of green moss. Inside the moss, hidden from every giant, lived the Mossfolk astronomers. Their observatory was a hollow acorn cap with a thimble-sized telescope pointed at the sky.
Every few days something strange happened. A great silver comet roared across the heavens, and a rain of water fell afterward. The astronomers recorded it in their star charts, but they could never predict it. Chief Astronomer Wren worried that the comet might smash their moss valley.
Ida, who lived in 4B, noticed the tiny telescope while she was pulling weeds. She knelt down and squinted. Wren stood on the rim of the acorn cap and waved a flag.
"Please warn us about the comet!" Wren called, in a voice as thin as a whistle.
Ida laughed softly. "That is not a comet," she said. "It's my watering can."
The astronomers went silent, and then they began to cheer. Because Ida watered the plants every Tuesday and Friday, the comet was not wild at all. It was dependable. Wren crossed out the old charts and wrote a new schedule with Tuesday and Friday circled in bright blue ink.
From then on the Mossfolk set out their buckets and bathtubs before each watering. They called the event the Watering Comet, and Ida always poured it gently over their side of the pot.