Artist who collaborated with her husband La Monte Young on a series of installations aimed at flooding and altering the sensesIt was said that, following their marriage in 1963, the artist Marian Zazeela, who has died aged 83, and the composer La Monte Young never spent a day apart – each day for them consisting of 33 hours and 36 minutes, thanks to a decision to live their lives according to a calendar in which the 168 hours of the conventional week were divided between five rather than s