I was about to enter the East Wing of the National Gallery and turned back for a moment; the shadow of Henry Moore's sculpture loomed large but there was nothing to indicate scale. Then new shadow appeared as a man began to read the plaque that told about the sculpture, producing a silhouette on the wall right where I needed it.
The sculpture garden at MOMA is a great place to take pictures. People ask me if this second photo is a collage, perhaps because the foreground and stone floor look too soft to share a frame with the sharp detail of the trees seen through the hole in the sculpture. But it's just a very tight shot, taken with a point-and-shoot camera.