I wonder how a 'world model' for a user interface could look like. Some loose constraints, understanding of what is possible and what not, but then each slice generated on the spot as the user traverses it. The model understanding the user's intent based on context so that e.g. when they right-click over an image, sensible options show up rather than a traditionally defined menu.

I don't think it would be a good user experience. I just crave the feeling of navigating such 'world'.