Minecraft wiki entry for Unused_textures, associated text: On 3 June 2010, Notch discussed on his blog plans to add different types of furniture to the game, which included doors. These postings include discussions of implementing said furniture in the form of entities as opposed to blocks, as was previously done for paintings in Indev, with Notch also stating his successful reimplementation of signs the previous day[23] as a block entity.[24] If implemented as a block entity, this would allow doors to have a smooth opening and closing animation,[24] similarly to what was added for chests a bit over a year later by converting them from normal blocks.