The most apt example that elucidates the above upanishadic passage is the modern day example of pictures playing on a cinema screen. Pictures keep playing and the seer may cry or laugh and sometime may associate with a character also. But the Seer is the screen, which is unchanging and support for the pictures that ever change.
Brihadaranyaka Upanishad [1]
Translated by Swami Madhavananda
Published by Advaita Ashram, Kolkatta
Om ! That (Brahman) is infinite, and this (universe) is infinite.
The infinite proceeds from the infinite.
(Then) taking the infinitude of the infinite (universe),
It remains as the infinite (Brahman) alone.
Om ! Peace ! Peace ! Peace !
I-i-1: Om. The head of the sacrificial horse is the dawn, its eye the sun, its vital force the air, its open mouth the fire called Vaisvanara, and the body of the sacrificial horse is the year. Its back is heaven, its belly the sky, its hoof the earth, its sides the four quarters, its ribs the intermediate quarters, its members the seasons, its joints the months and fortnights, its feet the days and nights, its bones the stars and its flesh the clouds. Its half-digested food is the sand, its blood-vessels the rivers, its liver and spleen the mountains, its hairs the herbs and trees. Its forepart is the ascending sun, its hind part the descending sun, its yawning is lightning, its shaking the body is thundering, its making water is raining, and its neighing is voice.
I-i-2: The (gold) vessel called Mahiman in front of the horse, which appeared about it (i.e. pointing it out), is the day. Its source is the eastern sea. The (silver) vessel Mahiman behind the horse, which appeared about it, is the night. Its source is the western sea. These two vessels called Mahiman appeared on either side of the horse. As a Haya it carried the gods, as a Vajin the celestial minstrels, as an Arvan the Asuras, and as an Asva men. The Supreme Self is its stable and the Supreme Self (or the sea) its source.
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The sacrifice, the yajna is All. The Yajna's stable and source is the unchangeable Supreme Self -- the highest shivo abode of fast moving vishnu who is the yajna.
Om
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