Undirected Time
This is one of the theoretical ideas out of Halfbakery (here), proposing, that time behaves much like modern Internet, where links are one-directional ("digraph"), and that to make the time be space-like, we just need to add the missing back-links to the web of alternate histories.
Not specified, exactly, how we would add those back-links though. Further ideas how to elaborate on this, are welcome~
+[項目]
這也許應該變成一個類別，因爲它僅提供一個概念，而不是方法。
This perhaps should be turned into a category, as it only provides a concept, rather than method.
無向時間？ 給時間加一個反向鏈接，那麼是雙向時間，或多向時間。