Eye Test: Are these strawberries really red or gray? (Video) - This Viral Strawberry Illusion Tricks Your Brain in Seconds

A new video has gone viral for its striking optical illusion involving strawberries. The clip uses a technique called the two-color method to make the fruit appear either red or grey. This trick plays on how the brain processes colour, creating a mismatch between perception and reality.

The method itself dates back over a century, rooted in a classic visual illusion first demonstrated by a British scientist.

The illusion builds on the principles of Benham's top, a rotating disk with uneven black-and-white patterns. When spun under flickering light, the disk produces the perception of colours—despite having none. British scientist Charles Benham introduced this effect in 1894, publishing his findings in the journal Knowledge.

The video applies a similar approach to strawberries. By altering the contrast and lighting, it forces the brain to interpret the same image in two different ways. Past experiences and expectations further strengthen the illusion, making the shift between red and grey seem even more convincing.

Viewers often struggle to reconcile what they see with what they know to be true. The technique highlights how easily visual perception can be manipulated, even with simple adjustments to colour and light.

The illusion demonstrates the brain's reliance on context when processing images. While the strawberries remain unchanged, the two-color method alters how they are perceived. This effect, rooted in 19th-century science, continues to reveal the complexities of human vision today.