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The two mirrors are mounted with a slight tilt in order to create the patterns.

The potentiometer slows one of the motors down, thus changing the pattern.

Parts used:

• 2 * 3v-motors
• 2 * square mirrors
• 1 * laserdiode
• 1 * potentiometer
• 1 * on/off switch
• 1 * 4xAAA battery compartment
• ... wires, hot glue etc...