Proc. 7 th Intl Conf. Disability, Virtual Reality & Assoc. Tech., [ArtAbilitation], Maia, Portugal, 2008 2008 ICDVRAT/University of Reading, UK; ISBN 07 049 15 00 6 1 “Passages”: a 3D artistic interface for children rehabilitation and special needs Paper for ICDVRAT / ArtAbilitation