This is just an awesome film and I demand you go rent it.
Frank Langella inhabits the character of a retired old man starting to have episodes of senility, needing care but hard to live with and desperate to hold onto his independence.
Because this movie is set in the near future, his rich yuppie son sets up a newfangled robot as Frank's helper/ babysitter/fitness coach, with the condition that Frank has to go to the nursing home if he won't accept the robot.
With echoes of "Driving Miss Daisy" in it, Frank and the robot form a... unique... relationship.
Langella is utterly believable here, with a tightly-controlled performance that draws you in as you try to figure out what he's thinking at each plot point.
The robot looks and moves a bit like an ASIMO, but is voiced by Skaarsgaard. The daughter is played by Liv Tyler an the librarian is played by Susan Sarandon.
The film is just note=perfect all the way thru, with a unique look that feels open and almost naked. The pacing is deliberate, but that just makes the payoff feel sweeter.