The current trend for films that immerse you in an environment continues. If you’ve been at sea with Captain Phillips (and are preparing to bale out with Robert Redford when All is Lost is released on Boxing Day) then you might contemplate a space walk with Sandra Bullock and George Clooney in  Gravity. News may already have reached you of the film’s state-of-the-art, 3-D effects. The extended opening sequence takes the audience out into silent weightlessness as two scientists attempt routine maintenance on the Hubble space telescope. The setting is certainly impressive – or rather, the effects are so good as to be imperceptible. You feel simply there in this extraterrestrial reality alongside the space crew, conserving your breathing for oxygen supplies as they do,