Visual challenges, such as noticing the difference between two images or recognizing patterns, are often part of IQ evaluations, a series of standardized tests used to assess intelligence.
But the real one is very obvious once you spot it. Don't fret if you're unable to accomplish the task.
Test your visual acuity with this week's visual challenge. Can you spot the bell within 13 seconds?
Research in 2010 found paleolithic cave artists in several caves in France deliberately confused woolly mammoths and bison in a similar fashion to a famous duck/rabbit illusion.
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