Minecraft wiki entry for Unused_textures, associated text: Ultimately, flowing liquids simply used a 32x32 texture each (which remained within terrain.png), rotated accordingly depending on the flow direction (which could be orthogonal, diagonal or knightwise, the last of which this sheet did not account for), and this file fell into disuse. It was eventually removed in Alpha v1.2.2 with the addition of texture pack support.