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And the zodiac signs are also divided in 4 groups (air, fire, earth, water) so it seems the idea of dividing people in 4 quadrants is pretty old.

What idiot-colors do you think it would corresponds to?

fire - red

water - blue

earth - green

air - yellow

pretty sure it's "scientific"

I don't know, the only thing I remember is water ~= Pisces ~= melancholic ~= <some color>

I've seen an analysis of the phenomenon where the four elements correspond to 4 major neurotransmitters, with the traits associated with having a lot of one element being pretty close to having a lot of the corresponding neurotransmitter. Maybe there really is a potentially useful means of categorizing people there.

Have you tried to be a scientist yourself and getting some numbers to test your hypothesis?

I am a scientist myself but unfortunately I have neither the time nor interest to test every little hypothesis of mine, especially outside my field of expertise.

Unlike zodiac signs there probably is some reality to catogrising people as say people oriented or analytic in their typical behaviour in the manner of the Idiots book.