Are you sharp enough to spot what's 'hiding' among these photos?

Sometimes, things may not be what they seem on the surface after you take a closer look at them.

This point is clearly demonstrated by a series of photos posted on AcidCow.

The website has published images that might seem ordinary on the first look, but are actually hiding some 'secrets' upon closer inspection.

See if you can spot them in the gallery above.

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