The realization space is
  [1   0   1                  x2   0   1    0    1                  x2   x2     x2]
  [0   1   1   -x1*x2 + x2^2 + 1   0   0    1    1   -x1*x2 + x2^2 + 1    1      1]
  [0   0   0                   0   1   1   -1   x2               x1*x2   x2   x2^2]
in the multivariate polynomial ring in 2 variables over ZZ
within the vanishing set of the ideal
Ideal with 2 generators
avoiding the zero loci of the polynomials
RingElem[x2 - 1, x1 - x2, x2^2 + 1, x2^2 - x2 + 1, x1, x2, x1*x2 - x1 - x2^2 + x2 - 1, x1*x2 - x2^2 - 1, x1*x2 - x2^2 + x2 - 1, x1*x2 + x1 - x2^2 - 1, x1 - 1, x1 - x2^2 + x2 - 1, x2 + 1, x1 - x2 + 1, x1*x2^2 - x2^3 + x2^2 - 2*x2 + 1, x1*x2 + x2 - 1, x1*x2^2 - x1*x2 - x2^3 + x2^2 - 2*x2 + 1]