Rainbow moving part thing?

I’m gonna be honest, I have no idea how to describe this. My friend wanted me to make one of these but I’m not sure how to, or where to start. Is there anything I should do to replicate this?

Beam instance with custom rainbow texture.

UIGradient manipulated by local/server scripts.

Example of beam method:
beamRainbow.rbxm (4.9 KB)

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