A tricky visual puzzle is testing people's observation skills. A cat is hidden in plain sight within a picture of a tree. The ...

An 'accidental' optical illusion has left many people scratching their heads as they attempt to find the hidden detail in the ...

Optical illusions use light, colour and patterns to cause a viewer to see something that's completely different to reality ...

Hidden in the shadows of the Middle East’s rugged terrain prowls one of nature’s most extraordinary athletes. The caracal, ...