Echo Block

Type	Crafting material
Placeable	✔️
Use time	15 (Very fast)
Tooltip	Only visible with Echo Sight
Rarity
Buy	10 SC
Sell	2 SC
Research	100 required

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

The Echo Block is a type of block which turns completely invisible once placed. It is sold by the Cyborg NPC for 10 SC when he is spoken to in a Graveyard. Once placed, the Echo Block cannot be seen by the player unless they have the Spectre Goggles equipped or are near an Echo Chamber.

Despite their invisibility, Echo Blocks retain the properties of normal blocks and can thus be hammered, actuated with an Actuator, stood and grappled on, used to hoik, and mined with any pickaxe or drill.

Crafting

Recipes

Result	Ingredients	Crafting station
Echo Block(Desktop, Console and Mobile versions)	Echo Platform(Desktop, Console and Mobile versions)2	By Hand
Echo Block(Desktop, Console and Mobile versions)	Echo Wall(Desktop, Console and Mobile versions)4	Work Bench

Used in

Result	Ingredients	Crafting station
Echo Platform(Desktop, Console and Mobile versions)2	Echo Block(Desktop, Console and Mobile versions)	By Hand
Echo Chamber(Desktop, Console and Mobile versions)	Echo Block(Desktop, Console and Mobile versions)20 Wire6 Gray Brick10	Heavy Work Bench(Desktop, Console, Old-gen console and Mobile versions)
Echo Wall(Desktop, Console and Mobile versions)4	Echo Block(Desktop, Console and Mobile versions)	Work Bench

Notes

When placed and actuated in water or honey, the Echo Block will let natural light from the background through, making the liquid much lighter than it normally is.
Echo Blocks can be painted, but they still remain invisible unless the player has the Spectre Goggles equipped.
When interacted with, the Echo Block produces bright, light emitting particles that are the same as when the Martian Conduit Plating is interacted with. That said, the amount of these particles is noticeably fewer with the Echo Block. This property makes it possible to spot the Echo Block even without the Spectre Goggles.

Tips

Echo Blocks can be used for various building-related tasks such as:
- Making furniture, liquids, or other objects appear as if they are floating.
- Hiding secret messages or symbols that are only visible with Spectre Goggles equipped.
- Building valid NPC housing with invisible walls.
- Creating invisible hoik paths.
- Preventing grass, vines, or saplings from growing.
Echo Coating is cheaper than Echo Blocks and has an almost identical invisibility effect.