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> she doesn't really know what I don't
Yes tulpas share your mind. But they don't share your "perspective". They usually use a different thinking process from your brain that you don't use consciously. Because of that they can be asked to "use more" or at least help you to find the "deeper parts of your being"

> but it's true she has showed me things I didn't think were possible.
Exactly. Tulpas can be very simply "promoted" into spirit guides with a little effort into the right direction.

> I will start with the catgirl sigil, as in, I will draw it on a paper and "open my mind" like I do to hear and see my tulpa. I will post results later.
Ganbare