Three relatively unknown Spanish architects -- Rafael Aranda, Carme Pigem and Ramon Vialta -- on Wednesday won the prestigious Pritzker Prize for a body of work that showcases modern materials like recycled steel and plastic.

It was the first time that the architecture prize has been shared by three people --  all partners in RCR Arquitectes, a firm based in Spain's Catalonia region.

"Their works range from public and private spaces to cultural venues and educational institutions, and their ability to intensely relate the environment specific to each site is a testament to their process and deep integrity," said Tom Pritzker, chairman of the foundation that sponsors the prize.