Echo Chamber

Echo material is invisible on purpose, which is fine until you are the builder who cannot find the hidden door in your own base. This turns all of it back on at once: Echo Blocks, platforms, walls and anything painted with Echo Coating.

Placed, it behaves like a monolith, covers a wide radius and can be wired to a switch. The better use is the vanity accessory slot, where it follows you everywhere and costs you nothing you would otherwise equip. On that basis it retires Spectre Goggles for anyone who builds with echo material, because the goggles want a slot you would rather spend elsewhere.

If you do place one and the floating cube bothers you, bury it. Once no light reaches the tile the cube stops glowing and effectively disappears, though Illuminant Coating will keep it lit no matter how dark the room is.