Watercolours and acryllics from early collaborations between Madelon and Rem Koolhaas dating from 1970 through to the founding of OMA in 1975.

​

The Office of Metropolitan Architecture was founded by Rem Koolhaas, Elia Zenghelis, Madelon Vriesendorp and Zoe Zenghelis as a collaborative office practicing architecture and urbanism.