Holding the knee to the chest flattens out the lumbar lordosis and stabilizes the pelvis. When it relaxes, it flattens the lens, generally improving the focus for farther objects. The grey-brown cap is initially bell-shaped before opening, after which it flattens and disintegrates. This flattens and stretches its grain structure. The plantar arch flattens, the solar concavity decreases in depth and heels spread. When it contracts the sheet flattens, (i.e. moves downwards as shown in Fig. Brouwer "flattens" his sheet as with a flat iron, without removing the folds and wrinkles. The glass, which is much harder than plastic, flattens the bullet and thereby prevents penetration. West of the ridge, the land flattens out and the vegetation turns to scrub. Contraction of the diaphragm flattens the dome, increasing the volume of the lung cavity. It flattens and takes the shape of a double reed. A "coil spring" flattens into an oval shape when the sides are compressed. It's a torus that, in three dimensions, flattens and passes through itself on one side. The incident flattens Custer's church and kills his entire congregation. Thus the "field flattener" flattens the image field.