Shark Cave Periscope

Peeking out from under the knit blanket roof, I realized my shark fortress needed a secret lookout! Gasp! Tucked right beside the sofa leg was an empty paper towel tube. I hauled it inside on my belly and wedged the hollow roll between two stacked velvet cushions. Putting one wide eye right to the opening—whoosh! The whole living room looked like a round, sunny tunnel! I tapped the rim with my red mallet—*bup-bup!*—and the sound zipped straight through the cardboard barrel like a tiny horn blowing across the deep blue carpet!