Instead, a two-dimensional flat surface hung unsupported in the air.

They saw how good these devices were at projecting a three-dimensional world onto a two-dimensional surface.

In the case of a two-dimensional spherical surface it would simply reproduce the sphere.

So its history in space-time is a two-dimensional surface called the world-sheet.

The wavefront of a sound wave is a two-dimensional "surface" traveling through space.

It allows you to create three dimensions on a two-dimensional surface.

This is used to create an image of a three-dimensional object onto a two-dimensional surface.

At a distance it is a smooth curved two-dimensional surface.

The string, which looks like a small line by itself, will sweep out a two-dimensional surface known as the worldsheet.

The two-dimensional surface of the Earth, for example, is finite, yet has no edge.