This correspondence proceeds. They both leave their letters in the post box adjacent to the walkway that prompts the extension that prompts the glass house. The post box inevitably gets into the demonstration by raising and bringing down its own particular minimal warning. The two individuals come to love each other, and this procedure includes the motion picture’s second inconceivable possibility.
We hear them having voice-over discussions that are apparently taking into account the words in their letters, however unless these letters are one sentence long and are traded immediately (which would mean intersection time travel crossed with visit rooms), they couldn’t in any way, shape or form be conversational.