When someone approaches the tea house they are visually scanned by by the OMRON Smile Scan.
“The system measures the degree of a person’s smile from a camera-recorded facial image based on its original criteria using facial key point movements. The resulting data is displayed onscreen with a percentage reading from 0% to 100%.”
In THR_33 this percentage controls how much the tea-house “eyes” open – so if they are smiling the “eyes” will allow for a direct line of sight between the visitor and the robots.
When TST_003 (the toaster) “sees” someone with its passive infrared sensor it will initiate its toasting cycle – it stops roaming and both its toasting drawers extend. Also, the inside of the robot illuminates.
When RDO_002 (the radio) “sees” someone with its passive infrared sensor it will play a randomly chosen sound sample from a library of samples of robots from science fiction movies.
When MXR_011 (the mixer) “sees” someone with its proximity sensor it will spin away from them (we figured when it is in regular use it would have to mix in one direction only – so in the tea house it would spin whichever way takes its fancy).