Green Flag to create your rectangle symmetry art. Press Space when done to bring back Project Thumbnail Screenshot.
This project uses the (X, Y) coordinates of the 4 quadrants: 1st (+X, +Y); 2nd (-X, +Y); 3rd (-X, -Y); & 4th (+X, -Y). This is a generative art program in that the size of the rectangles, their location, their colour, the thickness of the pen outline, and the number of rectangles are randomized in the coding.