Carpet

Carpets are thin blocks used for decoration. They are the same thickness as pressure plates. They are useful if you want a carpeted floor without using wool blocks as the material. They have no collision detection, allowing a person to walk over them without elevating $1/16$ of a block. This is similar to how pressure plates work. Carpets can be helpful when carpeting upstairs rooms without the ceiling of the next floor down being partially made of wool.

Usage

 * Carpets must be placed on solid blocks, and cannot be placed freely or be free-floating in the world.
 * Carpets can be pushed and pulled by pistons/sticky pistons, but will pop off if pushed onto a non-solid block, or over a hole.
 * You can craft them in different colors by placing two blocks of wool of your desired color next to each other. This means that you do not need a crafting table to make them.
 * Carpets cannot be crafted with two differently colored wool blocks.
 * Carpets can break falling sand and gravel.
 * Carpets can be used as an safer alternative to decorative flooring, as wool is flammable, but carpets are not.
 * Carpets are a more efficient alternative to flooring than full wool blocks.
 * Mobs are not able to spawn on Carpets.

History
Teppich Tapis カーペット Ковёр 地毯