The three circles drawn in this photo seem like they are different shades of blue, but are in fact all the same color. Lenstore While many mind-blowing optical illusions can play with your brain ...

All participants performed a task whereby they were asked to discriminate between different shades of blue on a scale from one to 20. The task was performed with and without verbal interference ...

The test, titled 'Is my blue your blue?' shows a series of different shades, and simply asks whether you think each is blue or green. So, how does your colour perception compare to the rest of the ...