These lines and lenses are clues only - so that you know what to do at the actual puzzle on the frame outside close to the cup stand. That is where you change the square.
The same way that the squares on the record are clues.
You have 3 lenses: blue, red and yellow.
You have 4 lines: pink/red, yellow, blue and pink/red.
When you swing one of the lenses - see that it covers a colored line which shows a different colored line. Now you know the 2 colors that produce that new color.
You cannot stop the swing. You note only what happens and apply it to the puzzle.