A clay maze is constructed on a cafeteria tray.
Water is added.
A drop of liquid soap disrupts the surface tension of the water and dreates currents that are made visible with food coloring. The purpose of this activity is to demonstrate how surface tension changes can cause fluids to flow. It requires shallow trays with raised edges such as cafeteria trays. Large Styrofoam food trays from a supermarket can also be used, but they should be the kind with a smooth surface and not a waffle texture. Light-colored trays make a better background for seeing the surface tension effects.