A Tower of Brown Slices

I bolted down the hallway and slid straight into the big sunny room! *Gasp!* Right next to the giant sofa leg stood a whole stack of cardboard drink coasters! Real cardboard, but in tiny round sheets! I scrambled up and threw my arms around the top one. I tugged with all my might, fell backward onto the rug, and flip! The coaster tumbled down right onto my tummy like a little brown shield! I tapped it twice—thump, thump! The most perfect secret fortress tile ever!