Twiggy

They go on about banning size zero, but I think Hollywood stars are the worst perpetrators. Most models are naturally long and gangly, while a lot of these young girls in Hollywood have gone on extreme diets. Their concave chests and bony arms are terrifying. It's scary to think that normal teenagers are tempted to copy them.

English Model

Isabella Bird

The Japanese look most diminutive in European dress. Each garment is a misfit and exaggerates the miserable physique and the national defects of concave chests and bow legs. The lack of 'complexion' and of hair upon the face makes it nearly impossible to judge of the ages of men.

English Explorer

Frits Zernike

About 1930, our laboratory had obtained a large concave grating and set it up in a Runge-Paschen mounting.

Dutch Physicist

Gene Tunney

A concave chest means that your diaphragm is sagging.

American Athlete

Use 'concave' for physical objects like dishes or reflectors that curve inward.

Physical Objects

'Concave' suggests that something is not flat, but rather it curves inside like a cave.

Not Flat

In optics, 'concave' refers to lenses or mirrors that spread out light rays.

Optics Context

Use 'concave' to describe geometric figures and shapes that have an inward curve.

Geometric Use

'Concave' also appears in nature, describing land or natural formations with an inward shape.

Natural Forms

Describing parts of the body, 'concave' highlights areas that are recessed or hollow.

Human Features

 when you are trying to convince an audience that a robot has a personality and he's capable of falling in love. So we went to work on these optically perfect binoculars, trying to find a solution that would maintain his true robot materials but solve this reflection problem. So we started with the lenses. Here's the flat-front lens, we have a concave lens

The magic ingredient...

 there they're concave bellies they're gonna be up and on the move again looking for some more potential prey but first it's time to just lie on a termite mound because that's what you do when you're a cheater as I said I don't think it'll be too

The 5 Musketeers Have an...

 even on a flat piece of paper, our brain reflexively creates the 3D concave or convex shape. Now for that creepy Lincoln upside down face. Faces trigger activity in areas of the brain that have specifically evolved to help us recognize faces.