In this small sketch, four separate landscape ranges are created in a for loop (counting down the variable i from 5, so that the largest range gets drawn first to appear furthest in the background layers). The sin() function is fed with an ever slightly increasing amount (+.06 each frame) from the a variable (responsible for the wave shapes) and the changing i variable from the for loop, responsible for the height (and thus perspective depth) of each range. The a variable is also used to modulate the background color that slowly shifts from a blue sky to black night.

Source code available here.