But this is supplemented by a fourth factor.

Our ideas and feelings and impulses group themselves around the attended object.

It becomes the starting point for our actions while all the other objects in the sphere of our senses lose their grip on our ideas and feelings.

These four factors are intimately related to one another.

As we are passing along the street we see something in the shop window and as soon as it stirs up our interest, our body adjusts itself, we stop, we fixate it, we get more of the detail in it, the lines become sharper, and while it impresses us more vividly than before the street around us has lost its vividness and clearness.
If on the stage the hand movements of the actor catch our interest, we no longer look at the whole large scene, we see only the fingers of the hero clutching the revolver with which he is to commit his crime.