I figured the forums needed more posts, so I'll share my thoughts on this.
One thing that's always fascinated me about the subject of tulpas is the fact that often they're formed unintentionally.
In fact in some of the earlier threads we were having, we had people going
"Oh, so that's what it was called? A tulpa?"
Because they had formed one, one way or another, beforehand.
Remember, that a tulpa is, as I've said a couple times, a big ball of concentrated thought.
An imaginary friend, taken to the next level not only applies as a description, but also as a possible way of their formation.
If you keep concentrating on that friend of yours, the idea is that they'll become somewhat real to you, or if you're looking at this from a supernatural point of view, the energy of your attention/focus brings them into life as a separate being.
I've seen stories of people claiming to have created tulpas (usually without directly using the term) through trauma, loneliness, etc.
Of course the trauma thing leads me to a whole other discussion.
That aside, it's very interesting that there are so many ways to go about forming what we call a tulpa.
Personally, I think there are a whole world of possible approaches that we haven't even thought of.
Hearing the thoughts of others on this would be nice.