Aera’s fragrances move with the air currents. If there are air currents in the room, it is important to position Aera upwind to take advantage of the air current flow.
If you are not sure of the air flow direction, light a candle and let it burn for 5 seconds. Then, extinguish the flame and watch the direction of the smoke. This is the direction in which Aera’s fragrances will disperse.