An idea is something you work on to make it work and a desire is much deeper in a way.
First of all, I had the desire for that format [silent movie], and then when I was talking to people, I felt that people needed justification. Why are you doing a silent movie? Is it just for your own pleasure? I felt it was not enough for them so I realized I have to choose the subject that will make things easier for them and to tell the story of a silent actor makes sense for doing a silent movie.
At the very beginning, it's a desire and that's not the same thing at all, because when you have the desire to do something, all the work you can do is a positive thing. It's not something that you calculate. An idea is something you work on to make it work and a desire is much deeper in a way. The immersion, it's classical, I watched a lot of movies.