This rendering picks random arrangements of the permutations of four colors. 'In Drawing Series IV, LeWitt used the Cross Reverse method of change, in which the parts of each of the original units are crossed and reversed.' LeWitt had four drawing series. '…with series 1 using rotation of the numbers, series 2 does a mirror, series 3 uses a "cross mirror", and series 4 uses a "cross reverse".'