Abstract: An amusement device which includes a transparent tank filled with a liquid medium such as water. Contained within the tank is a plurality of uniform diameter, positive and negative buoyant spheres. Disposed inside the tank is a downward directional tubal system and an upward directional tubal system which are used to move the spheres in opposite directions of their buoyancies. Located beneath the floor of the tank is an air pump which feeds air into the tubal systems to create currents which forcibly move the spheres through the tubes. Also disposed in the tank are downward and upward directional tracks which route the spheres to their respective staging areas, depending upon their buoyancies. For example, positive buoyant spheres travel upward in the liquid medium along the underside of the upward directional track while the negative buoyant spheres travel downward in the liquid medium along the top side of the downward directional track.