By: Mark Barber The Creeping Garden – a documentary about the professional and amateur fascination with slime mould in the scientific community – is a film without an argument;  a particularly troublesome direction to take with the documentary genre. The film begins misleadingly with archival news footage detailing the discovery of an unknown, slimy substance found in Texas, suggesting that the direction the film will be a generic blend between documentary and horror;  similar to two…