Blowing a conch shell as if on a trumpet has a long history in Hindu and Buddhist tradition. According to the font of all knowledge, Wikipedia, it is known as a shankha in Hinduism and is associated with the preserver god Vishnu. The symbolism goes deeper than that if you care to look it up.
Not surprisingly, there was a merch tent at the Krishna chariot parade. Everybody does it these days, certainly including religious institutions. There are equivalents at lots of Christian cathedrals and Buddhist temples.
I like how the young observer in the background fits into the picture.
