Mansur Gavriel Mansur Gavriel - Mansur Gavriel collaborates with Calder - of the Calder Foundation, a non-profit organisation founded with the aim to preserve and exhibit art by sculptor, Alexander Calder, as well as supporting emerging visual artists - to reimagine its signature tan Circle bag. Exclusive to MATCHESFASHION, it's crafted in Italy from vegetable-tanned leather set with a red and black print depicting the artist's work. Carry it alongside a neutral shirtdress to spotlight the unique pattern.