M.C. Escher (1898-1972) produced work that remains among the most widely reproduced and popular graphic art of the twentieth century. His brain-teasing prints use interlocking shapes, transforming creatures, and impossible architectures to challenge the viewer's perceptions of reality. Expressing what he called a "keen interest in the geometric laws contained by nature around us," his finely crafted compositions combine precise realism with fantastic explorations of pattern, perspective, and space.
Feedback loops come in two different kinds: positive and negative. Negative feedback loops are more common and work to keep a system stabilized or at equilibrium. Learn more about what negative feedback is along with several examples of biological and mechanical negative feedback loops. You’ll also find out the difference between positive and negative feedback.