One of the first things that greeted me upon arriving in India (via Thai Airways Flight from Suvarnabhumi Airport in Bangkok to Indira Gandhi International Airport in Delhi) is the brass plate (?) wall with these massive hands showing different poses. These, apparently and as I suspected, are Mudras for meditation.
Here is what Wikipedia has to say: A mudrā (English: /muːˈdrɑː/ ( listen); Sanskrit: मुद्रा “seal”, “mark”, or “gesture”; Tibetan. ཕྱག་རྒྱ་, chakgya) is a symbolic or ritual gesture in Hinduism andBuddhism. While some mudrās involve the entire body, most are performed with the hands and fingers. A mudrā is a spiritual gesture and an energetic seal of authenticity employed in the iconography and spiritual practice of Indian religions and traditions of Dharma and Taoism.
I think using these must be effective as I watched a friend of mine once, in the Bodhi Meditation Garden in Bodh Gaya (the land of Buddha’s enlightenment”), using one of these poses while meditating. Her body was kind of gyrating/revolving, without her knowing it. She explained it must be the energy flow from meditation. And she said she felt great afterwards!