The Sky Moves Sideways is the third studio album by Porcupine Tree, first released in February 1995. It's the first Porcupine Tree album to be released in the US (albeit with an altered track list), and the first on which the project was a band rather than simply a pseudonym for Steven Wilson. Regarded by many fans as one of Porcupine Tree's finest releases and a cornerstone of any Porcupine Tree collection, the album was recorded partly as a Wilson solo project and partly as a full band album, The Sky Moves Sideways is a diverse experimental rock release spanning space rock and progressive rock styles with long guitar led, instrumental sections.