Knowing that some things happen only once in a lifetime, a man walking down a street is convinced that he sees the girl of his dreams and wonders if fate is telling him to leave his wife.

A new mother wakes up after giving birth to her son and upon gazing at his face, feels an ephemeral peace that only comes once in a lifetime.

A woman tries to understand the space-time continuum and his love.

A young woman recounts three times in her life when she felt emotions of an unexplainable transcendent love: watching a ballet for the first time, making eye contact with an attractive librarian in high school, and listening to an old professor lecture during night classes at a university.

When a young couple in a park joins hands and miraculously teleports back home, the man’s subsequent obsession with recreating that one-off spark of magic drives a wedge in between them.

In an alternative past where each human can access the minds of all other people at all times, a car crash causes one man to lose connection, and he becomes infatuated with the feeling of having a singular mind.

A time-traveling man keeps returning to the woman he loves — but due to the limitations of time travel, years pass in between each of his visits. Meanwhile, the woman ages with every passing year, while he stays young as ever — and both must confront the reality that while their love may be timeless, the woman's time on Earth is passing far more rapidly than the man's.

A man considers the possibility of multiple realities, and creates possible scenarios for how his life could have turned out; including one where he is a famous football player, another where he's a stay-at-home dad caring for a daughter who has Down Syndrome, and another where she doesn't.

When a paddle-boating excursion goes wrong, a family makes one final sweet memory to cling onto during the years of separation and sadness that follow.

A young man struggles to rationalize with fate as he watches the people he loves experience immense pain and suffering. As he learns more about the physics of the universe and slowly teaches himself how to travel through time, he begins experiencing surreal moments where he can actually see the alternative paths he and his loved ones could have taken, and how they would all have been different if they had.