Redstone Pipes!

Redstone pipes would basically act as "3D" redstone wires. They can be connected to each other in all 6 sides and can be waterlogged. They power the blocks that they directly touch similarly to redstone repeaters. The pipes will automatically attach to any adjacent solid blocks and pipes when placed. I imagine you should be able to detach them by right clicking the extension you want to retract. They can be detected by redstone comparators and will keep its shape when pushed/pulled with a piston.

There is an illustration of what I think it should look like: https://imgur.com/a/PmCuYE8 The picture is drawn by me. The ingots look kind of like gold but they're supposed to be copper! I think the crafting recipe is pretty fair as you can get a ton of both elements using Fortune.

I think they would also look really cool as decorative blocks.. The design is inspired by the Soggy Cave puzzles in Minecraft Dungeons.