The Singapore sally port door – an optical illusion

The Singapore sally port door - an optical illusion
There’s a secret door down there.

A seasoned traveler photographs a hidden door called a "sally port" in a stone wall at Fort Canning in Singapore.

At first it might look as if you must head down to get to the door, but it’s an illusion. Actually the steps lead up to the door and it’s the photo that was taken from above.

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