From Creatures Wikia
The Home Spray is an agent that comes in a tiny blue bottle which can be placed just about anywhere. It can be pushed by both the hand and norns to release a cloud of cellular automata (smell) that exactly mimics the norn home, which is especially helpful for pregnant/birthing and otherwise generally homesick norns. To prevent your world from being over-run with Home Spray clouds by dispenser-happy norns, the bottle stops spraying after a few puffs and wont spray again untill some of the clouds have cleared. The CAOS was done by Emmental while the concept and Sprites were from Sentinal. It can be downloaded from Emmental's Docking Station Agents.