Up invites us into the life of Walter Griffin, a failed inventor obsessed with Philippe Petit's famed 1974 wire-walk between the twin World Trade Center towers. Walter's greatest moment of glory - a flight on a lawn chair festooned with helium balloons - is now long behind him, though Walter dreams of inventing something wonderful once more. His wife, Helen, has become disillusioned and frustrated at being the family's only breadwinner. Their teenage son, Mik