I would love to see a hologram projector. A machine block in which you place a single block in its inventory and it will project an image of that block in front of it. It could be configurable toinclude distance and possibly even size. Would be fantastic for hidden doors and traps. It would require EU to project its image. You would see a block there, but there is no block.
Hologram Projector
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Good Idea, but how much EU would it consume?
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I would say that's not IC²'s style of stuff. IC² has crapload's of great stuff, butnearly nothing only usable for pranks/hidden bases. Also, pwoercraft just added hologram blocks.