Here's proof :)
Just look at this detailing.
They are stacked like this in the 'Birdy's' outlets.
Details of the design.
"The true creative act is something else. It produces something that never existed before. Whether of small consequence or amazing significance, its usually generated by a spontaneous insight. A glimpse of the blindingly obvious ignited by the heat off wires caused by short circuiting thoughts. Insight is unreasoning" - Alan Fletcher, The Art of Looking Sideways.