A new optical illusion is going viral. It plays tricks on how we see colours. The illusion uses green, yellow, and black.

People can be made to see reddish green and yellowish blue—colors forbidden by theories of color perception. These and other hallucinations provide a window into the phenomenon of visual opponency ...

48 x 36 in. (121.9 x 91.4 cm.) Master Colourist Milly Ristvedt is playing with the classic grid pattern in this fun abstract painting. Geometric shapes—squares, rectangles, and fine lines in fresh, ...

Large colourful window designs characterise the otherwise minimalist structure, with geometric patterns enlivening its south, west, and east facades. The entrance is defined by a grid of nine ...

Modern kente is characterised by intricately woven and richly colourful geometric designs. You are most likely to see it in bold shades of yellow, blue, green, red and orange. Getty Images ...

Colourful geometric patterns have appeared in Walsall's Gallery Square - and many have been left wondering why. It may look like a giant hopscotch but the new addition is actually part of a plan ...