Old Lord Ouyuangong had aged considerably. His face was covered in wrinkles, and age spots had even begun to appear.
His wooden cane was no longer an ornament. Each day, he arrived at an unhurried pace, taught his class, then left just as slowly. As he neared the end of his life, one thing remained unchanged: his composure. Time and Spiritual Decline seemed to have eroded only his body. His state of mind was utterly unlike that of young people who already yearned for immortality, or emperors who feared death as old age approached.
This semester, the old gentleman used a voice amplifier for the first time.
It consisted of a microphone worn over his ear and a small, boxy speaker set on the lectern. Other teachers often used them for large classes too.
"The Twin Universe Theory is a fascinating one. Unlike the Parallel Universe Hypothesis, which exists only as a 'hypothesis,' the Twin Universe Theory was proposed by Ling Boxin on the basis of observation, calculation, and conjecture. If you read the book I recommended in your first year, you may already have some understanding of the Twin Universe and the angles and methods from which Ling Boxin observed it...
"Come to think of it, you're all in your fourth year now. Time flies...
"Ahem. Let me touch on it briefly—
"The so-called Twin Universe is a hypothesis Ling Boxin proposed after observing subtle contradictions between the influence he called 'Spirituality Force' and the way a series of worldly phenomena he called the 'Correction Collection' unfolded: our universe is naturally divided in two. Perhaps the two halves lie side by side, so that every plane is divided into a Left Plane and a Right Plane. The two develop separately, but whenever differences arise, the influence of Spirituality Force