Sponge

Sponge is a block which currently has no uses other than decoration. In the update, sponges will have new behavior and a variant, wet sponge.

Obtaining
Sponge can currently only be obtained in creative mode or by inventory editing.

Drying
A wet sponge can be dried in a furnace making the sponge reusable. If a bucket is placed in the fuel slot after the fuel is used up, including if the fuel was lava in a bucket, the water will drain into the bucket. This is currently the only way to get the water back.

Usage
Sponges currently have no use but decoration.

Sponges will absorb a 5×5×5 area of water around themselves in a "sphere". The sponge must be directly touching a water source to absorb water, and will only absorb water connected to an adjacent water block touching the sponge.

When a sponge absorbs water, it will convert to a wet sponge, which is darker, drips water, and is unable to soak up any more water.