This personable tree was shot by a Shropshire Star photographer near a high school in Shrewsbury, Shropshire, England. You can see more of these simulacra in Fortean Times's Fortean Gallery. In Fortean terms, simulacra photos depict "spontaneous or natural figures or images. These can occur in nature as well as in the chance conjunction of artefacts."
Previously on BB:
• Fortean photography Link
• Daikon "foot" Link
• Mickey Mouse tomato Link
UPDATE: Of course, clouds are a rich source of simulacra, but I especially like this Superman insignia posted by BB reader DaveX at his Startling Moniker blog. Link