Antimatter is a collaborative project of Mick Moss and Duncan Patterson, formed in 1997 after Duncan, former bassist and songwriter of Anathema left the band.

The pair released the first four albums while calling in various other artists, most notably Danny Cannavagh, the lead vocalist of Anathema, to contribute.

In 2005, after the release of Planetary Confinement, Patterson announced his departure from Antimatter, starting his new project called Ion. Meanwhile, Moss continued the writing of Antimatter’s next album, Leaven Eden by himself, and re-assembled the members of the previous album for the record.