It was founded by the Geert van de Camp (sculptors and installation artist), André Dekker (conceptual artist) and Ruud Reutelingsperger (painter), and in the late 2000s the interior architect Lieven Poutsma joint the group.

In the mid-1990s, the founders of Observatorium started jointly designing residential structures, abstract spaces in which artists and other interested parties were invited to briefly observe and reflect.

The abstract structure was based on specific dimensions by the architect Hans van der Laan.

This structure was resurrected a year later, in 1998, in the middle of a meadow in the Hoeksche Waard.

[3] From the beginning of the new millennium, the Observatorium has also designed permanent sculptures in public space, such as the Nieuw-Terbregge Observatory in 2001 and the Zandwacht on Maasvlakte 2 in 2015.