I like beer, and trying out different kinds of beer. Beer tastes multicoloured. Almost all beer has a dark red to orange flavour from the kinds of malt used, yellow-green tones from hops (Cascade is intensely lemon yellow!) Some dark beers taste more brown than others. The best pilsners have a very pleasant, golden orange taste of fresh bread. Wheat beers and sour beers can even have blue tones, but bright blue usually means strong carbonation.
The idea of a beer spectrum came into my mind when my SO and I had a conversation over a beer in a local pub. "This stout has a more even spectrum than the Guinness. Guinness has a peak in the red part and the top green part, while this one has more orange" My SO gave me a strange look. He obviously didn't have this kind of mental image of beer. Now, he usually asks me for a spectrum when we try a new beer.
After a beer or two, the mental image becomes more pronounced. It tends to fade from my mind and get harder to recall afterwards, so in order to build up a collection of images, I should draw them while actually drinking the beer. The images above are easy to remember, because they represent favourite beers which I often drink.