When you enter the room you see a monitor and a chair.
When you sit on the chair you can see a balloon inside the monitor.
When you reach your hand to touch the balloon,
the sensor will notice your shadow and the smell will spread out in the room.
The balloon is a virtual image, so you can't touch it.
The monitor will show you an easy explanation of "fragrance" with easy pictures.
The explanation is written not too long nor not too short, so it is very understandable.