A Split in the Light

I found a heavy glass prism resting near the open curtains. Outside, the night streetlamps were on. I stayed still on the dark wood for a long time. When a car passed below, a sliver of yellow light cut through the glass. It bent into faint bands of blue and amber across the tabletop. I stepped forward and touched the edge of the blue band with one paw. It was cool. It stayed there until the headlights moved away.