Observer Dependent Block

The Observer Dependent Block is a block added by qCraft. Observer Dependent Blocks exhibit the properties of any non-fluid, non-tile entity, non-nether blocks from Minecraft. The block's appearance is determined by which blocks it was crafted with and the direction players are looking at it from. Walking away from the block and looking back at it will make it cycle through the block properties, depending on the direction the player has moved.

Recipe
To craft the Observer Dependent Block an Essence of Observation is placed in the very center of the crafting grid; then, place the blocks that it will take the appearance of around it.
 * The top center slot will make that block appear when players look at it from the north.
 * The bottom center slot will make that block appear when players look at it from the south.
 * The left center slot will make that block appear when players look at it from the west.
 * The right center slot will make that block appear when players look at it from the east.
 * The top left corner will make that block appear when players look at it from above, though it will disappear once they are not.
 * The bottom left corner will make that block appear when players look at it from below, though it will disappear once they are not.

The recipe above means that the Oak Wood Planks are seen when viewed from the north, Cobblestone when viewed from the east, Grass Block when viewed from the west, Gravel when viewed from the south, Stone when viewed from above, and Moss Stone when viewed from below.