A Tulpa is a being or object created from and existing within the mind of its creator through mental conceptualization. Some describe it as self-imposed hallucination, or an imaginary friend for adults.
The idea of a tulpa originates in Buddhism, where it was extolled as an ability possessed by those who pursued the contemplative life. The analog in western occultism is the thoughtform. Tulpas were popularized on the internet by My Little Pony: Friendship is Magic enthusiasts (although modern tulpas are not always derived from fictional characters, or even necessarily animate.) The popularity of tulpas also spread on 4chan's paranormal board, where many myths about the agency and malevolence of tulpas entered the popular consciousness due to crossover with written creepypasta.
A person who creates a tulpa is called a tulpamancer, and the process of creation is tulpamancy. Tulpamancy can be divided into various processes
Research is important. Due to the flourishing tulpamancy there are hundreds of guides and resources available on the internet. As with most mental practices it is suggested to abandon any doubts before attempting it.
It's important to know what exactly you're creating. It is often recommended to create a list of personality traits you want your tulpa to posses, and to have an idea of what they're going to materialize as, if you desire a physical form for your tulpa. Some also find it helpful to create an imagined "wonderland" where they can react with their tulpa instead of in the actual world.
Forcing is the process of meditatively committing the personality of the tulpa to memory. This process may be done inter-mingled with visualization and narration if desired.
Visualization is the process of mentally visualizing what the tulpa looks like, in as much detail as possible, as well as imagining how it will look when performing actions or expression.
Narration is the process of communicating with the tulpa, either out loud or in one's head. Eventually responses are felt or even heard.
When the tulpa is well developed in mind it can be imposed onto one's physical environment by imagining its presence, much like one might imagine a ghoulish specter hiding in the darkness of the night. Tulpamancers sometimes go even further than a visualized and auditory presence and try to impose sensation of feel, smell and/or taste.