You missed the point, wie auch ich zunächst. Steht aber im Text.
“Entire generations grew up watching the famous blue screen of Commodore 64 computer. Many believed that the background was just artificially generated blue color, but this is not true. The photo of the sky was made near our house in 1980. On that day, Greg was driving when he saw the wonderful blue sky without a single cloud. He decided promptly to park his car, turned his camera towards the sky and took that, now legendary blue shade”, said Greg’s wife Wilma.
Will heißen, es geht um diesen Blauton im 'Startbildschirm':
"And that is something, you might not have known." –Tom Scott