Body Language
Grace and Trip are also programmed to respond to your own movements. For example, if you pace around the apartment and keep looking around, Trip may ask why you're fidgeting so much, and Grace might say that you're moving around so much because you're uncomfortable.
Here is another example.
The fact that Trip and Grace respond to the player moving around, as well as how they react, are very true to how people would act in real life. This realistic experience, along with their emotions and movements, allow players to test the limits of relationships, and learn more about how people act in a relationship.