This is "Symmetry," a clever seven-minute short by filmmaker Yann Pineill. As its title suggests, the first and second halves of the film are mirror images of one another – a creative decision that must have required considerable planning to be pulled off as seamlessly as it is here.
To be clear, the second half of the film is more than a reversed version of the first half. As Pineill explains:
This film has been written symmetrically: the second half is strictly like the first, but played backwards and mirrored. The second part doesn't act like a simple rewinding, but as the following of the first. It explores all sorts of symmetry: compositions, shapes, sounds and music, scenario, colors, actions, time...
Impressive work. More here.
[Spotted on Laughing Squid]