何謂後設？ What is "Meta"?

例如：「書」中書，在本書中，復收錄別書，則本書即後設書也。	With regard to a "book" of books, the book in which other books are collected is a metabook.
例如：「劇」中劇，在本劇中，復表演別劇，則本劇即後設劇也。	With regard to a "drama" of dramas, the drama in which other dramas are played is a metadrama.
例如：「夢」中夢，在本夢中，復遊歷別夢，則本夢即後設夢也。	With regard to a "dream" of dreams, the dream in which other dreams are experienced is a metadream.
後設，乃形式之自包絡。	Meta is a form covering itself.
又觀念世界以「世界」之形式包絡實體世界，故凡觀念皆後設，且當然後設猜想。	Moreover, since the conceptual world covers the real world by the form of "world", every concept is of meta, and of course, a metahypothesis.