The design is based on the swipe technology of smartphones and tablets, which is also used on the new website of the Rijksmuseum. "I hope that the stamps encourage people to discover the Rijksmuseum collection in the museum itself or on the website. There are so many special and beautiful works of art," designer Irma Boom says. The stamps are available at Bruna outlets, the Collect Club in Groningen, online via www.postnl.nl/collectclub, and at the Rijksmuseum. The stamps have an indefinite term of validity.