I was having a wee joke with you, Seeker. UM can become a bit of an obsession!
I don't know about OCD, but it seems to me that those who claim to have manifested a tulpa do so after an extended period of self-imposed 'mental/psychological isolation'. Maybe we can make some parallels with other behaviours brought on by isolation - such as cabin-fever?
This is interesting to me because I to created a game while walking to school as a child where if I herd a car behind me I would race it to the next tree or curb or something. I remember starting to do it so much that I evenchually started to think something bad would happen if a car ever beat me. I would race down the street terrified. It was only a week or so, then I decided this was silly and stoped doing it, but it wasn't easy. I had to force myself not to run when I herd a car..
To this day if I'm walking on a quite street and I can hear a car behind me, I have an ever so slight impulse to take off to the nearest tree, and I remember "the game,"
The method to create a tulpa seems to play off of these psycological capacities, it's very tememiscent of how people create compulsive disorders.