Aldo van Eyck, the 'Grand Seigneur' of Dutch architecture is one of the most significant architects of this century. He exerted a strong influence on his contemporaries during the fifties and sixties, and this can be seen in many of their buildings both in the Netherlands and worldwide. It was not merely his way of looking at buildings which was influential but also his perception of architecture; his visual thinking, his way of perceiving and structuring time and space, events and social coexistence. The architectonic treatises he wrote are still relevant and useful today. The present publication has been produced on the occasion of Aldo van Eyck’s 80th birthday in 1998. The architect has opened his substantial archive and has provided unpublished original texts, plans and photographs. All buildings from 1944 to the present day are documented in depth and an introduction by Vincent Ligtelijn explains clearly and lucidly the ideas and the design principles which underlie the conception of his buildings.