Twenty-nine lithographs of works by iconic Spanish artist Pablo Picasso are now on display in a free exhibit at Avenida Escazú shopping mall, west of San José.

Unable to resist the blank surfaces on the sheets of corrugated cardboard piled up in his studio on the French Riviera, Picasso, at age 88, used them as canvases for his “Retratos Imaginarios” (“Imaginary Portraits”), and then personally supervised the process of transforming them into lithographs.

The works display all the whimsical humor and cubist vision of the famed master. The Avenida Escazú exhibit opened Aug. 27 and will be on display through Oct. 25.