Stills

The colour of the brickwork makes it look as if the window has dripped down the wall, and the shadow diagonal makes the whole look faintly like a flag.

Lots to look at in the multiple reflections.
 

The diagonal of sunlight/shadow leaps out at one: the picture would probably work without it but there is no doubt that this is the dominant visual feature. It also makes for an interesting tie-up with the title. Comparing architectural styles, I would observe that the brickwork here is very British (even if the different-coloured brickwork is slightly exotic), whilst the central window construction is not familiar. At first I thought that the reflections spoiled the minimalist appearance but anchoring the apartment in its surroundings is valuable. This bit of the city is attractive in its own right but how well does the surrounding infrastructure support it visually? That window sill spells out deteriorating concrete!
 

I'm not so sure about the value of those shadow lines. However, it doesn't trouble my eyes that much. The tiny strip of hedge included along the bottom is a lovely touch. The reflections (soft) window works well with those much sharper and harsher bricks. Well balanced.
 

With all the verticals and horizontals the diagonal shadow appeals to me. I like the incongruity of the car parked in the top left window!
 

Thanks for the comments everyone. I snapped a couple of versions of this picture over the course of a few weeks. Initially I found the contrast between the geometry of the window/brick work and the plant interesting, but it didn't seem to work until this diagonal shadow came into play. I wouldn't have seen the shadow, but I was off to work early one day, so the sun was at a different angle.
 

Yes, the diagonal shadow really makes it more exciting. All the elements work nicely together for me. I agree with Rex about the reflected car being a plus.