The X•Y Chart™ is a colorful picture of mathematics. It shows the 10 by 10 multiplication facts in their natural environment, a table of rows and columns cornered in the first quadrant of the rectangular coordinate system.
The large white X and Y letters, connected by the multiplication dot, tie the entire scene closely to algebra—more closely than the X and Y of the widened black X- and Y-axes.
The perfect squares are colored gray to highlight the symmetry of the 10 by 10 table and its visible commutative law of multiplication.
The bright primary colors of the quadrants signal a change of sign, a positive-negative switch.
The sections of the quadrants, which begin at the intersection of the X- and Y-axes, invite the observer to continue beyond the borders of the chart toward the limiting infinities—the outer bounds of the actual math quadrants.
