Called "Katimavik" the upside
down pyramid was Canada's
entry in the 1967 World's Fair,
better known as Expo 67, held
in Montreal, Quebec, Canada.

Huge by any standard, it was one of
the main centre pieces to the Fair.
Reportedly, the shape came about
when the designers tried to glue
together the pieces of a previous
design by putting an upside down
ashtray on it for weight! The lights
went on and the rest is history.
Which is all very ironic considering
that Canada was one of the first
countries to implement a smoking
ban in most public places years
later.