Minecraft wiki entry for Item_Frame, associated text: The displayed item can then be rotated by right-clicking the frame. Items displayed in the item frame can turn 45° diagonally, with a total of 8 possibilities (90° and 4 possibilities if it is a map), and the frame outputs a redstone signal depending on the rotation phase that can be interpreted by a redstone comparator (note that this rotation value is separate from the clock or compass rotation). As long as the frame remains placed, it remembers the orientation of the last item it held, and uses it for the next item it holds.‌[Java Edition only]