Measuring and seeing the radio waves from a microwave motion sensor,
(as a "sitting wave", i.e. in coordinates where the speed of light is zero)
The SWIM is an invention from my childhood, and here are some pictures of it
mounted to a robot that Kyle and I (Steve), with some input from
Pete, built together. We built it,
for the most part, in a day or so (with further subsequent tweaks later).
In regards to the design, I was inspired by the windshield washers on a
bus I saw where the wiper blades always remained vertical even though
they were traced in a circular arc.
(link to high resolution.gif)
SWIMbot Augmented Reality Robot on portable stand:
Here's some fast sloppy pictures I took with no tripod or flash (hand-held Huawei P30 Pro)