Wheels of a working sibling to Curiosity (Mars Science Laboratory rover) at the Jet Propulsion Laboratory (JPL). One of them shows the Morse code pattern represented by small (dot) and large (dash) holes. The pattern on the wheel as seen on the picture is read from right to left. The code for the first line (dot, dash, dash and dash) is for J. The second and the third lines are for P and L respectively.