While I can't imagine ever installing one of these, London-based ID firm Slam's ThreeStyle door is weird enough that I had to give it a look, hoping to find some compelling reasoning behind it. Something like a pet door for children of differing ages, the ThreeStyle is a door-within-a-door-within-a-door, adding three sets of hinges, three latches and three handles where one used to do.

The copy doesn't shed any real light on the object's purpose:

ThreeStyle is primarily an expression of contemporary design, exploring and pushing what can be done with the humble door. However, there's know [sic] denying that it's of interest to the little people in our lives. Through Threestyle we can give the younger people in the world a greater connection with their environment during their growth through childhood.

Do any of you see an application that I'm missing? Or is this a case of "Just because you can, doesn't mean...."