Simple "rest on" new aluminum traffic trestle setup.
Large sound activated led flood lights like you see under trees in parks are spaced a few feet apart.
The hotel staff demonstrated it by clapping their hands, and the different color came on.
As usual, I had the boring part, just rounding and polishing the edges, but it's always cool to see the final application.
Clear acrylic sheets can be machine sanded, but they effect is not the same, especially close up.