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Sponge is a block notable for being able to erase water within a 5×5×5 area. However, this function only exists within Minecraft Classic and Indev.
Sponge is only available as a normal building block in Classic mode. In Beta it is possible to be obtained via inventory editing, but its only use is decorative because it does not remove water, as this ability was designed for the Classic indefinitely-duplicating water rather than the Beta flowing water with source blocks.
History
Sponge is a type of building block added in the update to 0.0.19a client update on June 20th, 2009[citation needed]. Notch has hinted on adding a fully functional and obtainable Sponge to Beta in a future update. [citation needed] Also, it was a yellow for pixel art before yellow wool.
Properties
Sponge is not affected by gravity, unlike sand and gravel so it will not fall if a block is deleted underneath it. Sponges do not need light to survive, and do not decay (sponges used to decay in the implementation of the 0.0.19a update, but this was changed within 50 minutes of the release).
Uses
An example of sponges keeping an area dry in Minecraft Classic.
As a building aid
A sponge can be placed around an area underground clearing the area of water. This can greatly help construction of underwater bases, homes etc. After the player constructed the structure, the sponges can be easily removed.
As an anti-griefing measure
A sponge can be hidden in walls, floors, etc. as a defense against griefers. This can confuse and slow down griefers when attempting to flood an underground development, leaving more time for them to be caught and stopped.
In small rooms, this measure, when implemented in every vertex of said space, can stop that room flooding altogether.
Hiding sponge in the corner of a wood-paneled room