It is [somewhat] known that there are 70 faces to the Torah; that the Torah can be interpreted in many ways, even 70.
Has this rule made its way into the realm of realistic usage, or is it just an exaggerated ideal not meant to be taken literally?
Probably the most well-known example of this concept would be the Tikunei haZohar (תקוני הזהר).
In this book, the first word of the Bible, בראשית, is expounded on in over 70 ways. For example, בראשית- ברית אש, בראשית- בית ראש.
Additionally, among the literature of Rabbi Nachman of Breslov, he writes that a similar book could be written on each world of the Bible.