The word Tulpa is from the Tibetan language and refers to any entity that attains reality solely by the act of imagination. The entity is created entirely within the confines of ones own mind, not drawn out, written down or even verbally described.

If its creator wishes, this "Tulpa Creation" may become physical reality through intense concentration and visualization. However, care must be taken to only bring to reality what is beneficial to the world, lest it's destruction becomes more problematic than its creation (see related account on Alexandra David-Neel)