Oriol Vilanova. Sunday

For the last 15 years Catalan artist Oriol Vilanova has visited flea markets every Sunday and has amassed a collection of some 34,000 postcards that he's classified into 100 sections. One of the sections has been tagged as 'unclassifiable' by the artist, leaving it open for more additions. Vilanova seems to have been drawn mostly to architectural motifs, but other themes include arches, flags, roads, cats, oranges, sunsets and zoos, among so many others, which in themselves make up a museum of various times and places that tourists and travellers have sent back home over the years.