This document discusses the visual elements of images, specifically lines. It defines different types of lines such as straight, vertical, inclined, curved, radial, and broken lines. It explains that straight lines suggest rigidity while curved lines produce movement. Radial lines suggest light and explosion. Broken lines transmit imbalance and lack of organization. The document also discusses graphic qualities of lines like direction, spatial distribution, volume, depth, and structure. Lines are said to organize space and separate planes. An activity is described to draw object contours and use line modulation to emphasize important features.