I created this Lifesized module and demos at one point to explore how much more we relate to objects drawn at their real size. https://github.com/francoislaberge/lifesized

Imagine buying shoes in Browser on a monitor and getting a better feel for its look via it being rendered on screen at its real size.

Also we should have an API for getting the Pixels Per Inch in browsers, it's a lie of 72 dpi everywhere currently regardless of the realdpi.