The document discusses various visual concepts including relationships between objects, elements of the communication process, and uses of lines and textures. Proximity, similarity and continuity are described as relationships objects can have with each other. The communication process involves a transmitter, code, message, channel/medium, reference, context and recipient. Realistic drawings use lines to portray shapes as seen, with volume and defined forms. Different line types can transmit different messages like straight lines for rigidity vs curved lines for fluidity. Visual textures include ornamental, accidental and mechanical textures. Texture can be used to organize and balance a composition by ordering shapes from greater to lesser importance.