Abstract: Providing a cup having a hollow part in the lower potion of it, in which rotary display part rotating in a certain direction (or both direction) is disposed, and the rotation of the display part becomes to be rotated when it is light, the rotation is stopped when it is no light, and it is stopped when it is no light, or the rotation of the display part is stopped when it is light by lift of the cup as a cup is about the ground, and when it is rotated the rotation of the display part from lifting of the cup, the luminary becomes to be emitted light for certain time.