A method includes sensing entities in first and second domains. If a first stimulus is present and an entity is in the first domain, the entity is transferred from first to second domain via a bridge. If a second stimulus is present and an entity is in the second domain, the entity is transferred from second first domain via the bridge. At least some of the first domain is outputted. An apparatus includes a processor that defines first and second domains and a bridge that enables transfer of entities between domains, an entity identifier that identifies entities in the domains, a stimulus identifier that identifies stimuli, and a display that outputs at least some of the first domain. The processor transfers entities from first to second domain responsive to a first stimulus, and transfers entities from second to first domain responsive to a second stimulus.