"Absolutely," Tadashi said with a wide grin. "Just let me know if you need me to clarify anything about the answer when I'm done."

He rubbed his chin, considering how to word his explanation.

"Basically, there are sensors around the door frame, things that are a bit like eyes that notice when something is moving toward or away from the door. There also might be a pressure plate in the floor. When the sensors or the pressure plate detect movement toward the door, they communicate with the mechanism that controls the door and tell it to open."