
Whatever we see around us (manifestation and everything) is nothing but Brahman's play/leela. This is told in a few texts.
Brahmasutra 2.1.33
लोकवत्तु लीला कैवल्यम्।
lokavattu līlā kaivalyam।
Brahman's creation is mere sport as is seen in the world.
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In Tantantre as found in Sarvollā...