Bentley's mind is...pretty ordinary. A safehouse with everything neatly organized. An old cookie jar sits on a table is one corner with a kiddie blueprint title the "Cookie Stealin' Plan" in a picture frame beside it. A world map is pinned up on the wall with thumbtacks marking several places: France, Holland, Italy, Cairo, the United States, China, Australia, Canada, Prague, and India...as well as Bloodbath Bay. Another wall is nicely decorated with pictures of the Cooper Gang, both the original group and the new members. The wall behind his desk is full of pictures of his girlfriend, Penelope. On a table beside the world map is a small model of Clockwek and blueprints and notes on each of the parts composing it.
The cookie jar has all of his childhood memories, especially those with his friends. The world map has strictly work-related thoughts and memories. The Cooper Gang pictures are various memories and feelings collected over time. Penelope's pictures hold everything he's ever felt about her and the most significant memories with her. The Clockwerk model, holds few memories, but mainly the scariest ones he has...including the moment he was crippled.
Bentley himself is sitting at the desk, working on his laptop or possibly watching you, but he generally will only directly interact if you speak to him.