Parity proofs of the Kochen-Specker theorem based on the 24 rays of   Peres
  A diagrammatic representation is given of the 24 rays of Peres that makes it easy to pick out all the 512 parity proofs of the Kochen-Specker theorem contained in them. The origin of this representation in the four-dimensional geometry of the rays is pointed out. 
Mordecai Waegell and P.K.Aravind
quant-ph