Optical illusion: Stare at this cross for a few seconds, and what happens next will surprise you!

This type of illusion is called the The Troxler Effect, and was developed by physician Ignaz Paul Vital Troxler in 1804. It reveals that everything exists in reality, although our perception makes ...
ScienceAlert on MSN

This stunning 'blue marble' fruit isn't actually blue – it's a wild optical illusion

The fruit of Africa's marble berry (Pollia condensata) is a true living gemstone, sporting a stunning metallic blue sheen ...