Again, different people see the same object as of different shapes, according to their point of view. A circular coin, for example, though we should always _judge_ it to be circular, will _look_ oval unless we are straight in front of it. When we judge that it _is_ circular, we are judging that it has a real shape which is not its apparent shape, but belongs to it intrinsically apart from its appearance. But this real shape, which is what concerns science, must be in a real space, not the same as anybody's _apparent_ space. The real space is public, the apparent space is private to the percipient. In different people's _private_ spaces the same object seems to have different shapes; thus the real space, in which it has its real shape, must be different from the private spaces. The space of science, therefore, though _connected_ with the spaces we see and feel, is not identical with them, and the manner of its connexion requires investigation. We agreed provisionally that physical objects cannot be quite like our sense-data, but may be regarded as _causing_ our sensations. These physical objects are in the space of science, which we may call 'physical' space. It is important to notice that, if our sensations are to be caused by physical objects, there must be a physical space containing these objects and our sense-organs and nerves and brain. We get a sensation of touch from an object when we are in contact with it; that is to say, when some part of our body occupies a place in physical space quite close to the space occupied by the object. We see an object (roughly speaking) when no opaque body is between the object and our eyes in physical space. Similarly, we only hear or smell or taste an object when we are sufficiently near to it, or when it touches the tongue, or has some suitable position in physical space relatively to our body. We cannot begin to state what different sensations we shall derive from a given object under different circumstances unless we regard the object and our body as both in one physical space, for it is mainly the relative positions of the object and our body that determine what sensations we shall derive from the object.