According to Freud’s observations and analysis of his nephew fantasy-making with a shoe, the fort-da game is the necessary foundational basis by which a child can rightfully count on a parent who leaves for work or an office party or a trip to the Bahamas with her younger lover to eventually return.
The child, controlling the outcome, sees that through simple will and aggression he can force the shoe to go, then facilitate retrieval whenever he so desires. This, according to Freud, makes it easier for the child to accept separation of all kinds. Fort-da is mourning play.
Hence, in tragedies, shoes play important roles. Actors must think carefully about where to step. Frequently, prints are drawn in light chalk on the stage. No one likes to share a pair. Letters are pulled from their lips, as are knives. When boots find their mark, victims claim the soles.
Children must be encouraged to play fort-da. Freud said so, and he had very healthy relationships. For those of you whose parents have left and never returned, you happen to be screwed, psychologically speaking. Perhaps, as in the most successful tragedies, you should seek revenge.