Chitrasutra

"The concern of the artist should not be to just faithfully reproduce the forms around him.  The artists should try to look beyond the tangible world, the beauty of the form that meets the eye.  He shoud lift that veil and look within. Look beyon "The phenomenal world of separated beings and objects that blind the reality beyond."  ~ Vishnudharmottara, AKA "Chitrasutra", 7th Century AD.  

https://sreenivasaraos.com/2012/09/18/the-art-of-painting-in-ancient-india-chitrasutra-1/