Let's take a minute here and admire the stark beauty of concrete floors.
Concrete floors are the embodiment of my beauty philosophy: no fuss, low-key, imperfect but not imprudent. No pretenses. They're hardy, easy to clean and require little maintenance, unlike wooden floors with their constant need for polishing and buffing lest they look uncared for. With concrete floors you just sweep and go. Perfect for lazy bodies.
I think concrete floors look best in interiors with a minimalist/industrial bent because having a floor like that can make a room feel cold and knowing that, why not go all the way? A lot of people feel uneasy in near empty rooms but isn't space a luxury? It takes a certain clarity of vision to fill a room with carefully chosen pieces that complement each other, nary a thing out-of-place, and what better way to show such restraint than a bare concrete floor?