With more than a century behind us of cinema as arguably the predominant popular art form, the movies have naturally evolved along with the changing times.
That which was considered the standard when talking pictures first came to the forefront in the 1930s would almost certainly seem pretty far removed from everything we see today in the eyes of modern audiences. As the decades pass, artistic, technological and socio-political developments make their presence felt on the screen.
However, it's fair to say that such advances wouldn't be so keenly felt without specific films and filmmakers willing to take real chances, brush aside the conventions of the day, and make an effort to do things differently.
Audiences may at times be put off by movies which take such an approach (witness the fallout over Darren Aronofsky's flagrantly confrontational mother!), but surely any film that hopes to capture the attention of viewers everywhere has to have at least a hint of that risk-taking, rule-breaking, iconoclastic spirit.
It's just that only a small percentage of films that manage to reach a wide audience really embrace that spirit whole-heartedly.