Sensing Objects (see, hear)
Being able to sense or detect other objects is key if you want them to interact. For example you want a guard to shoot automatically when someone gets close to it - the guard object needs to be able to detect when any other people objects get close by.
Kodu mimics the human senses of see and hear to achieve this. It allows you to determine how close to react to detect the objects with close by, far way, in front etc.