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The Relativity on Rotated Graph Paper tool was built in order to display the Minkowski spacetime diagrams on a rotated graph paper. The worldlines of three inertial observers carrying horizontal light clocks and the resulting clock ticks are drawn. Each clock consists of two mirrors a constant distance d away from an observer. The world lines of the clock's light rays form causal diamonds that can be used to count the clock ticks for each observer. A second window shows the causal diamonds i