[taneq]

> methods for using the subtle spatio-temporal radiance variations that arise on the ground at the base of a wall’s edge to construct a one-dimensional video of the hidden scene behind the wall

Interesting. I realised a few years ago that I automatically look down any time I approach a blind corner (when walking through an office, for example). Once I noticed it took me a while longer to figure out that I was looking for the subtle diffuse shadowing that means you're about to walk into someone.