Imposition is the act of perceiving a tulpa in the physical world with your body senses. It is considered to be a voluntary hallucination that can then be controlled by a headmate. Since it is simply a hallucination, the tulpa is only perceptible by the original creator. Imposition is generally mentioned in reference to visual sight hallucination, however with practice all 5 senses can be hallucinated.
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With the exception of persons who just impose or hallucinate naturally, this is a skill that needs to be learned. It is often started from a basis of imagination. A person closes their eyes, and imagines the tulpa in their mind. Over time, when the image in the mind is solid, a person will try to do the same while their eyes are kept open. This is known as open eyed visualisation. After a while, the viewed image slots into the surrounding reality naturally.
An alternative approach is to visualise your tulpa out the corner of your eye. Over time, the tulpa gains the ability to move further into your vision.
Despite the fact that visualisation is often focused on, it is often much easier to start with one of the other senses. This is highly individualistic. Therefore, it is a good idea to try having your tulpa touch you, or talk to you early on. The reverse, touching your tulpa, is much harder to learn. It is also a trick of some notoriety, with those saying they can feel the solidness of their tulpas when they push them always held under suspicion.
Eventually, the tulpa should take over this process. It should happen naturally, as any well developed tulpa will move by themselves once they are visualised in any way. If the tulpa takes full control of the process, it can be called projection, by analogy with the out of body experience terminology.
A feeling of your tulpa being in the room is a somewhat fundamental component of having a tulpa. In addition to helping along the imposition of the senses, cultivating such a sensation is often part of creating a tulpa originially. By feeling like your tulpa is actually there, you have a place to direct your attention towards when forcing