Mindscape anon again. My headcanon is that both sciency place and wheat field were dreams if not outright created, then heavily influenced by Bill. In first case he wanted to gain Ford's trust, so he filled the dream with things Ford might find appealing. In second case he wanted to mock Ford, so he filled the dream with painful reminders of Ford's mistakes and unfulfilled dreams, i.e. portal, swingset and Stan-o-War.
That’s an interesting idea. Bill is like a spider, laying out his web to ensnare his prey, with things that may entice them. Ford’s was the promise of knowledge and the secrets of the universe to change the world. And Ford didn’t realize he was trapped in the web until it was too late. And Bill taunting Ford later on is painful to consider, almost as if showing him that everything he worked for was just stripped away, and he was powerless to do anything to stop Bill.