Smart Finger

I love this concept from Korea. Everyone has experienced being in Korea and thinking that space between the wall and your bed is about that big only to find when you get home that your bedside table is going to have to be 'adjusted' with a hacksaw. I won't bother explaining how it works (using LED) as it's a concept and so therefore is only really a thing of science fiction but I did like the accompanying diagram below, which shows different cultures interpretations of distance.

Via Yanko Design.