06-29-2016, 03:19 AM
CUI is done client-side. That box consists of nothing in the vanilla game and the server would not be able to tell the client to make it.
The box works currently because the server knows what the selection is and it just places redstone dust particles around the selection.
The box works currently because the server knows what the selection is and it just places redstone dust particles around the selection.
![[Image: Nickster258.png]](https://projecteuler.net/profile/Nickster258.png)