Recessed studs - Open studs - T-pipe
https://gyazo.com/4a64d6c337217edf2aaafbdcc08097b9
Some blocks, such as Technique Block 1 x 2 - Pin hole 1 and center stud, have recessed studs (we'll call these Recessed studs).
By overlaying an open stud such as Plate 1 x 1 - Round Open Stud with a hole through it, you can stick a T-pipe straight through it.
LEGO:Patterns
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