Detachment
Detachment shows the human experience in a way that emphasises the rawness of our own lives. It shows emotional and physical vulnerability that feels grotesquely confrontational at first, but it's in such a deliberately normal light that you can't help but see yourself in each character.
Other than that, I'm in love with the way this was put together—the flashbacks, the awkward, pedantic cuts, the chalk drawings, and the progression to Meredith's perspective. It expresses the way detachment subtly rules their lives.
A child's intelligent heart can fathom the depth of many dark places, but can it fathom the delicate moment of its own detachment?