The Interspace is a vision of what the Internet will become, where users cross-correlate information in multiple ways from multiple sources. It is an applications environment for interconnecting spaces to manipulate information, much as the Internet is a protocol environment for interconnecting networks to transmit data. Navigating information paths and grouping related items is a fundamental operation. So is semantic retrieval and community classification, with interactive support for vocabulary switching across domains and subject indexing for amateur classifiers.