Take the child into some room with which he is not familiar, and let
him walk through the room slowly, then go out and make a list of
everything he can remember. Now let him look through again and see what
he can add to the list.
Walk a block down the street and have him make a list or tell you of as
many of the things which he saw as possible. Whenever possible return
for a second look so that the child may see and realize the many things
that he has omitted.
The story of the experience of the magician Houdin and the method which
he used for developing the observation of his son can easily suggest a
number of interesting, and as you have learned, very profitable games.