Colour is the most basic form of visual language. It speaks directly to our minds, bypassing our conscious minds and getting a direct line to our emotions. Hospitals are green and relaxing, also green is the complementary colour to the red of blood, so it reduces the eye strain from the visual tinnitus doctors see as they look away from a red bloody sight (this is true, I swear). You often hear of the green room on TV programs, where the guests relax before and after the show. Blue also is considered more relaxing and also has the effect of being a cool colour. In some of the large companies with brainiacs working for them (Microsoft, IBM, Apple, Bird's Eye) they actually reduce the air conditioning bill by tens of thousands a year in their large offices by painting the offices blue, thereby making the people feel cooler, even though they actually aren't.
These colour responses come from mankind's evolution, social memories passed unknowingly through the generations. Green is representative of trees, and the forest, a quiet place, full of bounteous food and fruit. Blue is the colour of the sea, calm, everlastingly relaxing. Yellow is the colour of the sun, happy. These colours are optical tai chi for the brain, relaxing it. Unfortunately, like tai chi chuan, there are darker sides to all the colours. The forest is full of bears and wolves and is, as such, scary. Green therefore should be the colour of anxiety. The sea is turbulent and dangerous, and always changing, so blue should be the colour of uncertainty and fear. The sun doesn't come out nearly often enough and when it does come out, we are angry at it for having taken so bloody long to do so, that yellow is now the colour of resentment. (As for the tai chi analogy, tai chi chuan means grand ultimate fist, and it is, beyond being a relaxing exercise, a lethal martial art. But the analogy falls apart here, because I think that that's a good thing.)
What I am saying is that far from being visual yoga, colour manipulation is in fact, more like subliminal messaging. I have spent the last four months compiling a database of the colours used in the bulletins, and have come up with a translation system. This translation system means that rather than actually reading the bulletin, since none of it is actually interesting, you can simply glance at it, and know at an instant what its contents are.
Unless I'm wrong.
Which I might be.