As it stood on its hind legs and took a piece of food from a window-ledge, I became sure that it was a cat.

Here it is plain that the cynical observation of my relative had, at the moment, partially excited an image of this feline hare.

In some dreams, again, we may become aware of the process of coalescence, as when persons who at one moment were seen to be distinct appear to our dream-fancy to run together in some third person.
A very similar kind of unification takes place between sequent images under the form of transformation.

When two images follow one another closely, and have anything in common, they readily assume the form of a transmutation.

There is a sort of overlapping of the mental images, and so an appearance of continuity produced in some respects analogous to that which arises in the wheel-of-life (thaumatrope) class of sense-illusions.