Incredibly beautiful.
I feel like this is what by Sofia Coppola's "Somewhere" aspired to be.

I love the type of slowness depicted: not done out of virtuosism for its own sake, but leaning in on the small, apparently insignificant moments like smoking in a balcony or washing hands - it was done beautifully, in a very personal way that allows you to _stay_ with the character for that second longer that allows you to really see him/her and what they're feeling. Or having that moment for you to fully experience your emotions as well.
So often a character is created through a sum of events and actions and words said, cut after cut - whilst you can learn so much from the silences! Such underrated empathic tool.
As much so as the camera focusing on the character itself (or some body parts: I loved Celine Sciamma's glance on hands in "Portrait of a Lady on fire" for example) as they're performing an action - focused, reading through them the emotions they're feeling rather than by showing the action itself. The bike videogame and the interview were brilliant instances.

The part I was astounded by, tho, was the mastery in showing how important a bond can be in making you pull out a better version of yourself you didn't even expect to be there: [spoiler] when Sophie says "happy birthday" on the bus, it's such a simple act and yet the pinnacle of many small ones that remind Calum of what's really life for[/spoiler].
As a personal note: never underestimate how you can affect loved ones, with a caring word of gesture or by simply being there

Such a movie needs a proper walk home after the cinema to let you thoroughly grasp the feelings it conveyed