Photographs of the structure growing in Experiment B. Green food coloring was added to make the structure more visible. The top two rows show horizontal and vertical views at times 14, 36, 78 and 150 minutes (the height of the tallest tower at these times was 1.0, 6.8, 11.0 and 22.1 cm, respectively). The two pictures on the bottom are magnification of the overhead view at times 36 and 78 minutes. The arrows indicate one particular point on the structure.