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I would like to create an entity sort of like a beacon that affects the entities around it, so I want my item to show something like the beacon or power pole effect range preview when the player is holding it to place it. Is there any way to get this preview on a non-beacon, non-power pole prototype?

https://wiki.factorio.com/Prototype/Ent ... cification does that. You can see a version of it on the electric miner - it highlights the given radius with the given sprite. I use it to illustrate the range of the fisheries, farms, and terraformers in Homeworld Redux.