A shot from the Peabody Essex Museum in Salem, MA that shows a an image on the wall as seen through a glass sphere (the image on the wall us unrecognizagle). Here's the museum's description of the exhibit:

Eye Spy features engaging works that explore the act of perception. Through manipulation of light, form, color and line, leading contemporary artists show viewers how perception is based as much on what we think we should see as on what we actually see. Abstract sculptures create surprisingly recognizable shadows, for example; holographic images fool us into thinking we're seeing 3-D. On view in PEM's interactive Art & Nature Center, Eye Spy encourages visitors to examine how perception and illusion influence the way we interpret the world.