The advice to not create lasting thought forms (also called TULPAS) comes from the experience of one person. I forget her name.
She said that a thought form being she created became evil and turned on her after a couple of months.
This advice applies to creating Tulpas, or servitors, and not objects.
Other magicians of note do not give the same warnings.
I have experimented with this over the years and have never had a problem.
So its best to experiment and discover such things through personal experience.
robert
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