The Universe Is a Loop — The Starting Point Is the End Point: Change Is Not Produced by Walking Forward; It Is Produced by Rotation

English version of the Chinese paper 《宇宙是个环——起点就是终点》 (DOI 10.5281/zenodo.24046294). For centuries the universe has been imagined as a line — the Big Bang as the first frame running to today, every step a "process." The further one chases along this line, the more questions pile up: what dark matter is, what dark energy is, why the expansion accelerates — nobody knows. This paper proposes we have chased down the wrong road: the universe is not a line, it is a loop. Change is not produced by walking forward but by rotation — two chains in the body (one governing invariance, one governing change) intertwine and rotate; one turn the unchanged becomes change (matter gives birth to consciousness), another turn change becomes the unchanged (consciousness rewrites matter). The starting point of the loop is the end point — a single point locks the whole loop. Brought down to the sky: the "Big Ring" discovered in 2024, 1.3 billion light-years in diameter, crosses the uniformity limit of the old theory — a trace left by the loop, not a coincidence. Two falsifiable predictions: next-generation surveys will find more ring-shaped structures; dark energy's equation-of-state parameter w is not −1 and drifts over time.