Blind man sees by using sonar (tongue clicking)

Daniel Kitsch -amazing chap.

In Derren's 3rd Event of Misdirection, Derren meets an extraordinary man,Daniel Kitsch, who has been blind from a young age and has developed a remarkable way of perceiving his environment by the use of tongue clicking.

I use to cave with a guy who went blind at age two. He used snapping of fingers sometimes otherwise he did not bother making a sound himself.

There is nothing like getting led off a mountain on a pitch black night in the middle of a thunder storm and the guy doing the leading is blind There are few people I admired more than this guy - had a PHd in math too.