The Temple of Human Passions (, ), also known as the Horta-Lambeaux Pavilion, is a neoclassical pavilion in the form of a Greek temple that was built by Victor Horta in 1896 in the Parc du Cinquantenaire/Jubelpark of Brussels, Belgium. Although classical in appearance, the building shows the first steps of the young Victor Horta towards Art Nouveau. It was designed to serve as a permanent showcase for a large marble relief The Human Passions by Jef Lambeaux. Since its completion, the building has remained almost permanently closed. Since 2014, the building is accessible during the summer time. History Inception and construction In 1889, Victor Horta was commissioned for 100,000 Belgian francs to design a pavilion to house Jef Lambeaux's sculpture The Human Passions on the recommendation of his teacher Alphonse Balat, King Leopold II's favourite architect. The small temple of classic look already announced the Art Nouveau manner associated with the architect. Although loyal to the formal vocabulary of classical architecture, Horta already managed to incorporate all elements of the new style. At first sight, the building looks like a classic temple. However, there is not a single straight line in the building. Every classic detail is revisited and reinterpreted. Horta succeeded in designing an almost "organic" interpretation of the classical temple, without completely abolishing any reference to an historical style. Slightly bent like the foot of a tree, the walls seem to have sprung organically. After World War I, Horta would return to this classicism in his designs for the Centre for Fine Arts and the Musée des Beaux-Arts in Tournai. The building, though, has had a turbulent history. The small neoclassical pavilion was originally planned for the 1897 Brussels International Exposition, of which it is one of the few physical remnants. Although completed in time for the fair, the collaboration between the architect and the artist soon led to an irreconcilable disagreement delaying its official opening until 1899. At first, Horta designed the pavilion's facade to be open, serving as a shelter on rainy days — without the wall and bronze doors behind the colonnade — so that the relief would always be visible for passers-by. But Lambeaux, against the will of Horta, wanted a gallery wall behind the columns. The dispute remain unsolved for years: on the day of the inauguration on 1 October 1899, the unfinished temple stood open with the relief visible from the