A Useful Wedge

I rolled myself across the polished wood, tilting rhythmically until I encountered the tall bookshelf. It was leaning just a sliver forward, vibrating whenever footsteps passed outside. To assist, I carefully rolled and wedged my round yellow body into the tight gap beneath the front corner. Now the wood rests snugly against my curved top. It is very dark down here, and very still. I will keep watch on every ankle that walks by.