"Creo draws on the ideal Forms," adds the scholar with the wand. "The ideal Form of human hair is thick and healthful, so it makes sense that your Creo Corpus botch made it moreso. For why it's woven, you'd need a better theorist than I, or five of them and a really long argument. 

"Please don't take this as a reason to go experimenting with the nature of botches or trying to make them happen on purpose. Entire books have been written on those who've tried. Mostly they die spectacularly and take our best laboratories with them. If you'd been a magus in the fullness of your power, that hair could have filled the whole room and suffocated us."