Optical Illusions An eye catches mine on a lake shore walk, an eye of wood, driftwood, a dreamy eye of a creature at rest in the sand. Returning through the woods,I spy other eyes winking at me from the beech tree’s bark, its gray smoothness interrupted by eye-like knots. In a clearing, I look up and see a ship of clouds sailing the blue sea. Ever see a stony visage in a rock or a stump you’d swear was a bear? Turns out there is a name for these optical illusions, pareidolia, seeing familiar images in objects, images that aren’t, in reality, there. It’s a survival skill that humans, alert for danger, learned long ago to gain time to prepare a defense in case that stump really was a bear. Nowadays it’s fun to come across these visions of the imagination. Right now, I have a strange feeling I’m being watched. Oh, it’s only the face on the maple outside my window. He does look vaguely frightening, like one of those masks, worn by people in various cultures to scare away the evil spi...