We can however illustrate the doctrine by the more familiar facts of life without recourse to the abstruse speculations of theoretical physics.
The waves as they roll on to the Cornish coast tell of a gale in mid-Atlantic; and our dinner witnesses to the ingression of the cook into the dining room.

It is evident that the ingression of objects into events includes the theory of causation.

I prefer to neglect this aspect of ingression, because causation raises the memory of discussions based upon theories of nature which are alien to my own.

Also I think that some new light may be thrown on the subject by viewing it in this fresh aspect.
The examples which I have given of the ingression of objects into events remind us that ingression takes a peculiar form in the case of some events; in a sense, it is a more concentrated form.

For example, the electron has a certain position in space and a certain shape.