That is a very good point. But just because something is a clich does not mean it isn't true.
Ideas ARE everywhere.
Whether or not we can do anything with them is another matter. Have a look at these and see what I mean. There is an old wall with a wooden door in it. The truth is very sad and the story is told on a memorial in a local churchyard. Close to the wall is a large pond, a few yards away from the doorway.