It's something that most of us learn as toddlers. In the first round of the Easy level, you'll be tasked with adjusting a bright pink rectangle to match a dark blue rectangle By the first round of the Hard level, the two rectangles will both be very similar shades of the same dark brown A box at the top of …
From the sky to the sea, there are several things on Earth that we all know to be blue. During the test, you'll be shown a series of six shades and asked to click on one of two buttons – 'This is blue', or 'This is green'. At the end of the test, you'll be shown where your blue-green boundary …
