This is a much more complicated type of object than a mere colour, such as the colour of the Needle.

I call these simple objects, such as colours or sounds, sense-objects.

An artist will train himself to attend more particularly to sense-objects where the ordinary person attends normally to material objects.

Thus if you were walking with an artist, when you said 'There's Cleopatra's Needle,' perhaps he simultaneously exclaimed 'There's a nice bit of colour.' Yet you were both expressing your recognition of different component characters of the same event.

But in science we have found out that when we know all about the adventures amid events of material physical objects and of scientific objects we have most of the relevant information which will enable us to predict the conditions under which we shall perceive sense-objects in specific situations.