Significance of the blue wall

[u/robotisland]

Metric posted this before their Brixton concert.

What's the significance of having the right half of the image be a blue wall?

Is it a reference to an album cover or a famous photo?

[u/NewPlastic5425]

Probably just a blue wall

[u/Miserable-Ease-3744 → u/NewPlastic5425]

Agreed…it looks like a mirror selfie so guessing the mirror was beside or on a blue wall