Yes they can be created with intense concentration and meditation......most ppl though don't know how to meditate that deeply.....Hey just forewarning here, considering recent events here, were very picky on what kinds of sigils and types of witchcraft are brought up here.
If you’re talking about any other sigil than this
View attachment 14038 I’ll have to edit it out. Btw Tulpas can be made through intense concentration alone if I’m not mistaken.
So what do you want a Tulpa for? Just curious, want to experiment, other?