The electrochromic glass isn't just for aesthetic. The tinting works as an ND (neutral density) filter, which is a piece of glass that you traditionally place over a camera lens to "stop" it down and bring out better exposure when scenes are overly bright. Here you can see how the colors become more accurate and there's less overexposure around the lights when the ND8 setting is turned on.
Cheap leather makes me sick. I get car sick whenever I'm in Ubers with cheap leather. Real leather, however, smells great and doesn't give me a headache. OnePlus says the "papaya orange" leather on the OnePlus Concept One is the same leather used in the McLaren 720s car seat. I can confirm it smells fab. Really high-quality cow skin.
I was bracing myself for disappointment when I heard the "invisible camera" might have been purely decorative. But the ND filter feature gives the OnePlus Concept One a little legitimacy. Photographers and videographers know how important an ND filter is for capturing good footage. Now, OnePlus just needs to improve the software side of its cameras — the image processing — and then it'll truly be on par with the Samsung Galaxy, Google Pixel, and iPhone.