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A three-dimensional plot with yellow walls of various heights along the edge of a parallelogram shaded gray and drawn through the points (0,0,0), (200,425,0), (525, 525,0), and (300,100,0). On the first side, the yellow wall extends perpendicular to the parallelogram and has one maximum and minimum. On the second side, the wall’s height curves increasing to a height of 2.7. On the third side, the height slowly curves down to 1.7. On the final side, the height dips to a minimum of 0.4 and then to a maximum of 2.5 before returning to the starting point.