Kṛṣṇa and Balarāma also learned the art of architecture—how to construct residential buildings. They learned to recognize valuable jewels by studying their luster and colors. Then They learned the art of placing jewels in a gold and silver setting so that they look very beautiful. They also learned how to study soil to find minerals. This study of soil is now a greatly specialized science, but formerly it was common knowledge even for the ordinary man. They learned to study herbs and plants to discover how they would act as medicine for different ailments. By studying the different species of plants, They learned how to crossbreed plants and trees and get different types of fruits. They learned how to train and engage rams and cocks in fighting for sport. They then learned how to teach parrots to speak and to answer the questions of human beings.
They learned practical psychology—how to influence another's mind and thus induce another to act according to one's own desire. Sometimes this is called hypnotism. They learned how to wash hair, dye it different colors and curl it in different ways. They learned the art of telling what is written in someone's book without actually seeing it. They learned to tell what is contained in another's fist. Sometimes children imitate this art, although not very accurately. One child keeps something within his fist and asks his friend, "Can you tell what is within?" and the friend gives some suggestion, although he actually cannot tell. But there is an art by which one can understand and actually tell what is held within the fist.