If you've ever waited on a subway platform, you're familiar with that woosh of air that comes through the tunnel prior to a train's arrival. Swedish ad agency Akestam Holst and production company Stopp produced an ad for a new line of hair care products that puts that phenomenon to good use.
The creative Swedes put ultrasonic sensors behind video screens on a subway platform in Stockholm. They then connected the sensors to the screen via a Raspberry Pi microcomputer.
The video screens showed a woman with long flowing hair. When the sensors detected the approaching train … Read more