Show gui only throug glass

Any know how this does work

at 14:20

you can see the numbers 3 4 0 through the glass, but it is only visible through the glass

it seems to be a gui as it seems to change numbers of every play through

I tried to recreate it in studio, but don’t get the inteded behavior, in fact the gui disappears all together.

So any know how does this work?

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