Video: People fall for street illusion

Fall into this well and even Lassie won't be able to help.

This video tweeted Maria Popova @brainpicker - if you don't follow her, you really should - reminded me of the street art by Julian Beever, who spent IdeaFestival 2009 figuratively digging a beautiful underground tunnel beneath the city of Louisville. The effort attracted quite a few curious onlookers, and, we're quite sure, was responsible for more than one unsolved disappearance.

Find our video interview with Julian here.