"Lux" is uncompromising Brian Eno. Hints of tunes, rather than actual tunes - the magic happens in the spaces in between. To me, this is archetypal ambient music. It exemplifies the genre that Eno himself helped to create. Unlike his last two albums for Warp, he makes no concessions to the "dance" audience. This record probably could have been recorded any time in the last 35 years and sounds completely timeless.
The gatefold card CD sleeve is also very good: as well packaged - without being over-packaged - as a CD can be, I think.
Run a bath, light some candles then put this on, pausing only to put your copy of "Ministry of Sound and Cream presents Pure Chillout Classics for Housewives" in the bin.