A large blue rooster currently stands on the fourth plinth at Trafalgar Square, which has become a showcase for temporary artworks.
Mayor of London Boris Johnson said: "The placing of challenging artwork amidst the historic surroundings of Trafalgar Square creates a delicious juxtaposition that gets people talking and debating, underpinning London's reputation as a great world city for culture."
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Two FA Cup final ticket will be blasted into space tomorrow, giving some lucky fans (or passing aliens) the chance to go to Wembley.
Passengers were stuck this morning on packed rush-hour trains after a power supply problem hit busy commuter routes.
The Metropolitan Police said the building material was found in the force's former training facilities.