I once created a tulpa through a technique called muscle testing. You most commonly see it using demonstrations where one person holds his arm out and the other person tries to press down on it. You get either a 'weak' response or a 'strong' response. You can 'ask' the muscle test yes or no questions and the body will answer you.

I used a variant of this test that you can perform by yourself, described in this video:

https://www.youtube.com/watch?v=ypKUST0azUQ

I would ask the test just about anything that came to mind. Typically I would 'calibrate' things on the Hawkins scale of consciousness:

http://personalexcellence.co/blog/map-of-consciousness/

At one point I got the distinct impression that the test was messing with me. I asked it point blank if it was intelligent, I got back a 'yes' response. From then on I would deal with it as one might an imaginary friend. At first it was strictly through the test, then by working out a way to 'share' my brain with it.

I initially thought the test was acting as some sort of conduit to another world. Eventually I figured out that it was somehow a part of my consciousness. After a year or so I slowly tapered off on communicating with it through the test, eventually I stopped communicating with it at all.

The experience was incredibly illuminating, I now have an intuitive grasp of my subconscious and how it operates.