Ad: Twisted Cord Illusion (False Spiral) Postcard
What exactly do you see when you take a look at this twisted cord illusion? Showcase optics fun with any of these optical illusion gifts featuring the twisted cord illusion also known as the false spiral or Fraser spiral illusion. Caption includes the following note for viewers: "Notice the overlapping black arc segments appear to form a spiral. Nevertheless the black arcs are a series of concentric circles." Make others do a double-take with their eyes today! myOpticalIllusion
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