Optical illusion puzzles are fun and tricky pictures that are designed to play with our eyes and brain. When we look at these puzzles, we might see elements that might not be present in the image.

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Full frame of bright green and golden wave filmed at sunrise while swimming in the ocean. Captured in 4x slow motion off the south east coast of Australia. Royalty-free licenses let you pay once to ...

It's a win-win, and it's why everything on iStock is only available royalty-free — including all 4K Resolution images and footage. What kinds of royalty-free files are available on iStock? How can you ...