This activity is performed in the "kitchen" of your house or apartment.
For this activity you are going to spend three hours in the kitchen without eating or drinking. That's right three hours without eating a crumb or drinking a drop. During the said three hours you can do anything your integrity and ethic dictate with the exception of eating, drinking. Consume nothing, zero, zip, zilch, -- drink not, eat not. You may cook if you wish just don't taste the food while cooking and don't drink a single drop of water, tea, milk, gin or any other liquid.
This may seem like a long time to go without eating or drinking. Okay, if three hours is like totally too long do two hours. If two hours seems too long move along to another activity and just forget about this one.
Usually we carry the illusion that rooms are connected by having the same floor, the same ceiling, and if we poke a hole in the wall between two rooms we assume one could see from one to the other. The rooms are assumed to be part of the same house or apartment.
For this activity, get the very definite notion that two chambers are only connected by the trans-chamber portal called a "doorway." Not unlike space ships docking in orbit, the floors could be at different levels -- either microns or miles in difference. The rooms may even waver in their relative positions. Other than the connecting doorway, rooms are totally unconnected -- potentially in totally separate universes.
Get this notion of rooms being totally separate spaces connected only by a doorway running well. Then very deliberately step through the doorway. Step through as if you are stepping through a force field.
Spend three hours in the "kitchen".
When you leave the "kitchen" at the end of the three hours do it in the same deliberate fashion as you entered.
After you exit the "kitchen" say to yourself (out loud), "Well, that's that. This activity is complete."