Hidden arch
Under the post, are the lines of this archway meeting in the middle? They sure are! The post makes the lines look mismatched, but sure enough, they connect! Click “reveal” in this link to see the illusion in action.
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Standing tall
Which of these monsters charging through the catacombs is taller? More optical illusions that use the background to trick you! Without the backdrop, you can see that these two freaky fellows are exactly the same – including their height.
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Stitched lines
Are these long diagonal lines parallel? They sure don’t look it, but they are! Removing the smaller “stitch”-like lines shows the truth about this optical illusion.