Quening Assistant by Peter Luo from china
designer's own words:
In many situations like going through security check or buying the train ticket, we often have to stand in a long line. As every line is very long, so we can not know which line has fewer people and can save us more time. "Queuing Assistant" uses the thermal sensor to record the number of people in each queue. The electronic screen displaying the current number of people in the queue helps people choose the queue with fewer people to save queuing time. When someone at the front end of the queue has left, the recorder at the front end of the queue will transfer data to the corresponding display screen through wireless network. The display screen at the end of the queue will adjust the number on the screen according to the number of people who join or leave the queue. The number on the electronic screen will add one if one person enter the queue and will minus one if one person leave the queue.
“Queuing Assistant” uses the thermal sensor to record the number of people in each queue. The electronic screen displaying the current number of people in the queue helps people choose the queue with fewer people to save queuing time. 
Usage scenarios.
In many situations like going through security check or buying the train ticket, we often have to stand in a long line. As every line is very long, so we can not know which line has fewer people and can save us more time. 
Solution.
When someone at the front end of the queue has left, the recorder at the front end of the queue will transfer data to the corresponding display screen through wireless network. The display screen at the end of the queue will adjust the number on the screen according to the number of people who join or leave the queue. The number on the electronic screen will add one if one person enter the queue and will minus one if one person leave the queue.