Labels:text | screenshot | font OCR: it, so that it does not itself exert any pressure or form any foundation." D To explain the location of the center of a drop of water, Leonardo describes, with characteristic precision, the action of a dew- drop as it grows in size and changes shape. Its spherical shape flattens, due to increasing internal pressure on its surface tension. Text and illustrations E together explain that as the dome of the drop flattens out under these conditions, its surface comes closer to the perfectly round shape of the universal sphere.