The gradual working in of motifs in the first four tracks, essentially just four parts of the one concept. This level of adding layers is the sort of thing you'd think would be preserved for classical music and the use of motif in particular is something that you normally associate with soundtrack music. The differing feels within the album on the various tracks. Within a single disc Jarre has gone to different places and it all hangs together as a piece of work which is an achievement in itself. Jarre wears his heart on his sleeve. There are a number of dedications on this album championing various causes both specific and non specific. Having worked himself a comfortable niche within which to operate Jarre could have just gone along putting out more of the same and not offering anything of himself. But here we get a glimpse of what makes this artist passionate and that makes for a more inclusive and impressive experience. Electronic tunes at their best. Listen to this and chill.