Most nights I arrange the items on the kitchen counter to see what sort of shadows I'll get in the morning. It's sort of a random process - things get moved around and whatever I was trying to do gets ruined, the sun isn't right, it's cloudy, etc. Rotate the picture in your mind ninety degrees clockwise and then ninety degrees counterclockwise, and hopefully you'll notice the profiles; sort of a pair of Easter Island portraits in silhouette.