The ovoid is one of the basic shapes of traditional Northwest Coast art. Concave on the base and convex on the top, the corners are rounded. It is made from a single form line which swells along the ...

In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

When we interpret a shaded picture as a three-dimensional (3D) scene, our visual system often needs to guess the position of the light source in order to resolve a convex-concave ambiguity.

While we may be more familiar with lathes being used to shape staircase balusters and table legs, here an eccentric cutter can create both convex and concave objects from a variety of mediums.

Its convex and concave features can soften sound in noisy environments. Facet Brick by Justin Bright (Gnome Architects): Diagonally chamfered corners add texture and patterning versatility ...

In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.