Yantra is the Maths of the Gods

Ajit Mookerjee- Yoga Art (1975)
Inner visualisations - Yantra was the form of images coming through a yogic meditation corresponding to celestial forms, manifestation, chakra systems and relationships to creation.

Page 125- Rajasthan, 19th century

Indian and Scandinavian medtiational child art (Aged 7-10). Images produced by children after 10 minutes of meditation. Experiment conducted by Madhu Khanna <3  - Page 91