From silhouettes to shadows

You might think I hit lucky with my timing when I photographed these birds' silhouttes through closed curtains this morning. Actually, they're not real birds. They are silhouette bird shapes stuck to the window to prevent real birds from flying headlong into the glass and stunning themselves. The early morning sun then cast their shadows on the curtains. The effect was so pleasing that I had to snap it. Didn't think it would be my blip, but somehow didn't get round to taking any more photos today, so here it is.