Yuval Ne'eman (1925 - 2006) and Murray Gell-Mann (1929 - 2019)

The Ω^- is the classic example of why physicists had to invent color. It has spin 3/2 and consists of three identical quarks, in an s-state. Thus in order to have an antisymmetric state function, each quark must have a different color and the color state is the only part of the state that is antisymmetric.