import math;
size(7cm,0);

// picture grid(int Nx, int Ny, pen p=currentpen)
// Return an Nx by Ny unit square lattice with lower-left corner at (0,0).

add(shift(-4,-4)*grid(8,8,blue));

add(rotate(45)*grid(6,6,red));

dot("$(0,0)$",(0,0),S,green);