Do you see the optical illusion diamond shape that appears at the end in the center? Watch this satisfying rainbow sand art optical illusion come to life using only colored sand. This handmade design is built from repeated rainbow layers that extend outward from the center, forming a mirrored geometric shape that looks somewhere between a diamond, a tunnel, a doorway, and a folded rainbow pathway. Each band of red, orange, yellow, green, blue, and purple sand is carefully placed to create a clea

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