We may distinguish between different steps in the full act of visual
recognition. First of all comes the construction of a material object of
a particular figure and size, and at a particular distance; that is to
say, the recognition of a tangible thing having certain simple
space-properties, and holding a certain relation to other objects, and
more especially our own body, in space. This is the bare perception of
an object, which always takes place even in the case of perfectly new
objects, provided they are seen with any degree of distinctness. It is
to be added that the reference of a sensation of light or colour to such
an object involves the inclusion of a quality answering to the
sensation, as brightness, or blue colour, in the thing thus intuited.

This part of the process of filling in, which is the most instantaneous,
automatic, and unconscious, may be supposed to answer to the most
constant and therefore the most deeply organized connections of
experience; for, speaking generally, we never have an impression of
colour, except when there are circumstances present which are fitted to
yield us those simple muscular and tactual experiences through which the
ideas of a particular form, size, etc., are pretty certainly obtained.

The second step in this process of presentative construction is the
recognition of an object as one of a class of things, for example,
oranges, having certain special qualities, as a particular taste. In
this step the connections of experience are less deeply organized, and
so we are able to some extent, by reflection, to recognize it as a kind
of intellectual working up of the materials supplied us by the past. It
is to be noted that this process of recognition involves a compound
operation of classifying impressions as distinguished from that simple
operation by which a single impression, such as a particular colour, is
known. Thus the recognition of such an object as an orange takes place