Prism in the Morning Sun

I hopped up to the warm window sill to greet the morning sun and spotted a clear glass triangular prism left beside an open sketchbook. Tilted sideways, it cast bright rainbow bands right across the white paper! I stepped close, admiring the dazzling colors, and gave the pointed glass corner an experimental nudge with my hard beak. Clink! The heavy glass swung round, sending the bright violet and yellow light dancing up the wall like flying ribbons. I cocked my head in delight, tapping it gently again to watch my personal rainbow spin across the whole sunny corner!