Abstract: A circular sealed panel 1 includes transparent walls 10-13 separated by spacer rings 14-16 to form intervening sealed chambers 18-20. The chambers are filled with different colored translucent liquids leaving colorless air spaces in each chamber. The panel is supported on friction rollers 2 and 3, one of which is driven by a motor to rotate the panel. The spacer rings 14-16 are formed with cup-like recesses 32 which collect air from the top of each chamber and release it towards the bottom of the chamber so that colorless volumes of air continuously travel upwardly through the chambers thereby presenting continuously moving shapes and color combinations to an observer looking through the panel.

Abstract: A circular sealed panel 1 includes transparent walls 10-13 separated by spacer rings 14-16 to form intervening sealed chambers 18-20. The chambers are filled with different colored translucent liquids leaving colorless air spaces in each chamber. The panel is supported on friction rollers 2 and 3, one of which is driven by a motor to rotate the panel. The spacer rings 14-16 are formed with cup-like recesses 32 which collect air from the top of each chamber and release it towards the bottom of the chamber so that colorless volumes of air continuously travel upwardly through the chambers thereby presenting continuously moving shapes and color combinations to an observer looking through the panel.

Abstract: Superimposed light-transmitting walls 10-13 define intervening chambers 14-16 containing differently colored liquids, and discreet volumes of gas are introduced into a bottom region of each chamber such that rising volumes of gas present moving differently colored areas to an observer looking through the walls. The display area is increased by forming liquid reservoirs 20-22 at the top of each chamber, with anti-spill valves 30-32 which admit or release air when a preset pressure differential is exceeded. A positive displacement pump recirculates gas from the reservoirs to respective inlets 34-36 at the bottom of the chambers. Gas flow separators are provided adjacent to the inlets, and the chambers have side spacers with inward projections to prevent volumes of gas from tracking up the sides of the chamber.