ROBERT BROOK / SCIENCE PHOTO LIBRARY ROBERT BROOK / SCIENCE PHOTO LIBRARY
Wireframe geometrical models with positive and negative curvature. A surface has positive curvature at a given point if it curves away from that point in the same direction (relative to the tangent to the surface), whereas it has negative curvature if the surface curves away in two different directions. Illustration.
Model release not required. Property release not required.