One, the recommended 50mm focal length lens here is specific to full-frame cameras with 35mm sensors. If you have an APS-C camera, which is quite common, then you want a ~32mm lens, and if you use M4/3 like I do, then you want a 25mm lens, to achieve this same effect.
Of course it's a lot simpler to abstract away the camera sensor size and simply look at field of view, which for a 50mm full-frame lens is about 40 degrees. This is actually not that much; it's quite "zoomed-in" in appearance compared to everything you can see at once through your eyes, which is at least 90 degrees field of view plus more for your peripheral vision. So the following quote from the article is definitely inaccurate:
> The 50mm lens is called a “normal” or “standard” lens because the way it renders perspective closely matches that of the human eye.
To really match the experience of being there, you need an ultrawide lens to capture the full human field of view. The 40 degree field of view of a nifty fifty is like looking through a narrow doggy cone of shame.