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 thin snow and 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