Walking anywhere in the world at different times of day you can see dramatic changes as the light goes from midday bright to dusk.  Early morning/late afternoon light can transform a simple scene to one of great interest as shadows grow longer and shorter.  Consider city streets with shadows of tall buildings crossing sidewalks, cars, busses and people.  Similarly bright light casting shadows on a flight of stairs creates a canvas of black and white stripes. Just as powerful are shots where the impact of the image is derived from patterns in the composition such as the line-up of palm trees in the tropics with the shadows cast along a sandy beach, rows of theater chairs etc. Different images, interesting interpretations of your own shadow are welcome as well.  Be creative - send us your best.