Above illustrations: Top illustration, a transmitter at a fixed location generates an electromagnetic wave which is received by a moving antenna. The moving antenna is affixed to a linear display medium that displays the voltage of a received demodulated signal. As the receive antenna moves through space, it displays each point along the electromagnetic wave. Below are shown two alternative embodiments of this effect.
SWIM (Sequential Wave Imprinting Machine) is a device that imprints waves onto your retina or photographic media as you wave it around in space [Mann, IEEE CE 2015 4(4), Cover+pp92-97] [Mann, Wavelets and chirplets, Cover + pp99-128, World Scientific 1992].
This is due to an effect that I discovered in my childhood, when moving a broken oscilloscope (no sweep) back and forth to simulate a timebase by moving through space. What I discovered in spacetime was that the base can be spatial rather than temporal, and thus the spacebase shows waves perfectly aligned with where they actually are in physical reality, when a sensor (such as a receive antenna) is moved back and forth together with the oscilloscope.
A traveling wave may be represented by cos(ωt-kx). A superheterodyne receiver picks up this signal and, let's say it is in tune with the transmitted signal, thus the local oscillator (chalk drawing on left) is cos(ωt). Thus the result, coming down to baseband is cos(-kx) = cos(kx).
Thus what we see traced out by the oscilloscope is a function cos(kx) only of space, not time. The wave is "sitting still" now, and we can see it in exact alignment with where it is in space (no longer traveling at the speed of light).
More generally, I discovered that this concept can generalize to overlay any physical quantity on top of reality, and works especially well when the alignment with reality occurs in the feedback loop of a process -- something my colleagues call the "Mann effect".
I want to now describe a very simple way that you can reproduce this effect.
One of the simplest ways to reproduce this effect is to wave a dotgraph back and forth in front of a Doppler radar while the dotgraph displays the "zero IF" (zero Intermediate Frequency) of the radar.
You can demonstrate this effect for a low cost (under 10 dollars) with something you can build in less than an hour.