Black and white is not what cameras used to do; it is what attention does. Strip the colour and a street reorganises around light, line and gesture — the diagonal of a shadow, a figure at exactly the right distance, the geometry that colour was distracting you from.
This collection favours hard light and patient timing: noon shadows sharp as staircases, lone commuters printed against bright walls, wet asphalt doing silver.
A monochrome wallpaper is also, practically, a diplomat. It matches every icon set ever designed and makes app colours look chosen. The city does the restraint so your screen does not have to.