The use of glass as a building material was encouraged in particular by garden design, as the protection of exotic plants required the construction of greenhouses and orangeries. In a record time of just five months, Joseph Paxton, himself a garden designer, put up the Crystal Palace in Londons Hyde Park for the Great Exhibition of 1851. A totally glazed exhibition hall, of gigantic proportions by the standards of the time, it was a milestone in the history of building in glass. The result was a totally new spatial quality and a new aesthetic, as interior and exterior could now enter into a quite unique mutual relationship. Since then, architecture without glass has been inconceivable, and glass has been used as a construction material by renowned architects worldwide for industrial buildings and private houses. Glass masterpieces, erected in particular in combination with other materials, for example, wood, stone or steel, demonstrate the potential and variety of glass architecture.