TECTURE.) Expositions.—Expositions are generally housed in temporary buildings constructed for the purpose. The plan problem is of special interest to the architect, because it gives him an opportu nity to make experiments on a large scale which he might not care to risk in more permanent buildings. The Columbian exposition in Chicago in 1893 changed the whole tendency of architecture in America, creating a veritable renaissance of classic styles. The Paris Exposition Universelle in 1900 experimented with the flow ing line and naturalistic ornament, but with no permanent effect on architecture in general. The Wembley exhibition near London revealed certain possibilities in the use of permanent concrete construction, but lost much effectiveness through lack of distinc tion in setting and approach. The French, on the other hand, made the most of their Exposition des Arts Decoratif s in Paris in 1925, and many of the temporary buildings displayed archi tectural forms of unusual interest : the straight line, the post and lintel, sculpture in low relief panels, strong contrasting colours; classical mouldings, capitals and cornices were conspicuous by their absence. The influence of the Paris exposition can be seen in certain commercial buildings in America, and will doubtless have a lasting effect, because the style so readily adapts itself to modern forms of machine-made construction. (See EXPOSITION