Why did the film and theatre industry change the appearance of Jesus?

This week I am walking in the beautiful grounds of Quarry Bank in Cheshire, and I'm talking about why the film and theatre industry felt the need to alter the appearance of Jesus on stage and screen... Please remember these opinions are just my own and do not necessarily reflect those of other Christians or Christian churches. If you have a subject you would like me to walk and talk about from a Christian point of view then please let me know in the comments.