What was the name of the futuristic tower built for the 1951 Festival of Britain?

The Skylon was a futuristic-looking, slender, vertical, cigar-shaped steel tensegrity structure located by the Thames in London, that gave the illusion of 'floating' above the ground, built in 1951 for the Festival of Britain.

The Skylon was the “Vertical Feature” that was an abiding symbol of the Festival of Britain. It was designed by Hidalgo Moya, Philip Powell and Felix Samuely, and fabricated by Painter Brothers of Hereford, England, on London's South Bank between Westminster Bridge and Hungerford Bridge. The Skylon consisted of a steel latticework frame, pointed at both ends and supported on cables slung between three steel beams. The partially constructed Skylon was rigged vertically, then grew taller in situ. The architects' design was made structurally feasible by the engineer Felix Samuely who, at the time, was a lecturer at the Architectural Association School of Architecture in Bedford Square, Bloomsbury. The base was nearly 15 metres (50 feet) from the ground, with the top nearly 90 metres (300 feet) high. The frame was clad in aluminium louvres lit from within at night.