Leiden University at the university. The learning and reputation of Jacobus Gronovius, Herman Boerhaave, Tiberius Hemsterhuis and David Ruhnken, among others, enabled Leiden to maintain its reputation for excellence down to the end of the 18th century. At the end of the nineteenth century, Leiden University again became one of Europe's leading universities. At the world’s first university low-temperature laboratory, professor Heike Kamerlingh Onnes achieved temperatures of only one degree above absolute zero of −273 degrees Celsius. In 1908 he was also the first to succeed in liquifying helium and can be credited with the discovery of the superconductivity in metals. The
Harm Kamerlingh Onnes the physicist and Nobel Prize winner Heike Kamerlingh Onnes. In his early years from 1915 to 1925 his work was influenced by modernism. In 1918 he designed a number of abstract stained-glass windows for the Spark House, which was designed by Jacobus Oud. From 1925, he started to take the everyday reality as his subject, and from that time he only made figurative works. It was after a visit to the studio of Mondrian, that he had realized that abstract art was not for him. Some of his designs for stained-glass windows have discoveries of physicists Pieter Zeeman and Hendrik