Sequential Wave Imprinting Machine visualizing radio waves as "sitting waves"

Notice how the radio waves which travel at the speed of light actually "sit still" in these pictures, e.g. notice how the peak of one of the waves always seems to "sit" at the 8-inch mark on the ruler (marked off in 1-inch increments):

As an animated .gif image, you can see how we're moving around in the room but as we trace out the wave, whether slow or fast, it always stays in roughly the same place: