In that year they decided to bring their art and architecture work together in a joint practice, under the motto of “The Fusion of Art and Architecture on a Digital Platform”. In their early years of coöperation they organized the events Artificial Intuition (1990, , Berlin), The Synthetic Dimension (1991, Amersfoort), Sculpture City (1994, Ram Gallery Rotterdam), and realized 20 public art and architectural projects: the inflatable weblounge ParaSITE (1996, Rotterdam Festivals), the Musicsculpture in Oldemarkt (1998), the TT Monument in Assen (2002), housing projects Patio Housing The Hague (1991, Dedemsvaartweg) and De Kassen (1991, ), where Ilona Lénárd mapped colorful dazzle paintings on the entire facade, the housing project Dancing Facades (1992) in De Hunze in Groningen, the Waterpavilion (1997) at Neeltje Jans, featuring the complex Hydra structure on the basis of an intuitive 3d computer sketch, and later the housing project Fside (2007) in Amsterdam. Ilona Lénárd, born and educated in Hungary, was also instrumental in setting up the ONL Hungary office (2007 - 2017) in Budapest to realize the Bálna Budapest, originally named the CET Budapest, and to enter a number of competition projects among others the City Hall competition Budapest (2008, third prize). Kas Oosterhuis aims at "changing the building industry from within" by his digital design to manufacturing approach, which was developed with the design of the Waterpavilion (1997, Neeltje Jans). Kas Oosterhuis and his team teamed up with the steel manufacturer and invented a direct file to factory procedure, producing only those data that the CNC machines of the steel manufacturer needs to produce the building components from the raw material. Autolisp routines were used for the data exchange. For the Web of North-Holland (2002) ONL used a variety of programs, including 3d digitizing the handcrafted model, Maya for the digital 3d model and the construction of the complex geometry, and Autolisp routines for extracting the data needed for the cutting of the steel plates. The A2 Cockpit in the Sound Barrier the step was fully scripted, therewith replacing 3d modeling as the leading design tool for computer programming. Before the term parametric design became popular in the last decade as propagated by among others Patrik Schumacher of ZHA, ONL practiced parametric design as from the design to production procedure of the Waterpavilion in 1997.