Wirkkala was often inspired by nature. His work is characterised by its wide scope and exceptional craftsmanship. He has been compared to the master craftsmen of Scandinavia's past. Wirkkala drew a great deal, but he also wanted to study personally the various stages of making objects, such as glassblowing: "I always try to be involved in the whole working process in which the object achieves its final shape". The majority of the approximately 100 lamps Wirkkala designed for serial production were conceived between 1959 and 1961. The earliest, however, is the Triennale light from 1951. The conical piece is a turn-moulded opalescent glass pendant, which was originally made for the Finnish Pavilion at the Milan Triennale.