A prism on the sill

A tiny splash of rainbow caught my paw... shimmering on the baseboard. I crept out from under the radiator, padding toward the low wooden window stool. I paused... tilting my head to listen. Silence. Sitting on the sill was a small, heavy glass prism resting on an open linen-bound notebook. Very cautiously, I nudged the glass corner with my nose. It swiveled slightly, sending a bright band of red and blue light dancing across the pale wall. Tucking my front paws together behind the notebook's cover, I watched the colorful beam hover in the quiet morning stillness.