Different ways foams on walls can fall. (IMAGE) Tokyo Metropolitan University Caption Liquid in foams drain downwards through Plateau borders under the action of gravity. This leads to accumulation of liquid at the bottom, which can either pinch-off or simply stay at the bottom as the foam slips down. Credit Tokyo Metropolitan University Usage Restrictions can be used with credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.