This patten is representative of a pendulum. It consists of 10 steps that take about 1/4 second each step. The pattern stops at each edge to give that feeling of the pendulum slowing and turning around. Although the LEDs aren't perfectly in line for part of the swing, the speed and the use of half intensity keeps the illusion of a swinging arm. When in automatic pattern mode, once the arm has swung back and forth has run 12 times it advances on to the next pattern.