Ford's mindscape is the physical representation of Ford Pines' mind.
Ford first appeared in his mindscape in "The Last Mabelcorn," where Bill Cipher first manifested as a crop image before appearing for real. After summoning and destroying the interdimensional rift Ford's been keeping, a portal to the nightmare realm opens, and Bill leaves with a cryptic warning before Ford wakes up and leaves his mindscape.
- 215. "The Last Mabelcorn"