One of the plane surfaces slid aside as they approached.

On a plane surface this would be the shortest distance between two points.

To plane the surface of a board, start at a 45 degree to the grain.

Compass and circular planes are used to plane curved surfaces.

First you began with a geometry of plane surfaces?

Since the main tube of this instrument is square, it can be applied to any plane surface.

The first practical means of applying pressure on a plane surface.

So it requires the crystal of one plane surface and an inner curve.

Go back to the analogy with the creatures on the plane surface again.

The deformed image is painted on a plane surface surrounding the mirror.