According to pen and paper rules a spell book has a limited number of pages, I believe there are actually 2 types of spell books one is a large tome consisting of 100+ pages, this though is not used fo adventuring, ie., it is much to heavey to lug around dungeons. The other type is a traveling spell book containing about 50 pages or so. First off, a 1st lv. spell requires roughly 1 page to scribe, and a 2nd lv. spell is also about 2 pages and so on. There just isn't enough room to scrawl a myriad of spells within it's cover. Secondly, pages for a spell book are extremely expensive, due to there high quality. If your a mage you really don't want shoddy paper for your studies. And lastly how in the world would you remove a spell and it's notes from a page, It's pen & ink remember, also the amount of time and effort to transpose a spell into a book would certainly make the most simple cantrip a valued possesion, hence the price of a piece of paper with a spell on it ie,. a scroll. All an all you have to consider that this book contains the lifes work of one whose soul purpose it is is to understand the arcane intricasy of magic that is woven into the very fabric of existence. I dought Nietzche, Einstien or DaVince would simple discard a portion of there notebooks to simply add a new revelation to it. All revelations, even those that appear insignificant compared to something grander are in there own right, comprised of greatness and meaning. So even though one might want to erase a fireball spell, so as to scribble the awesome magic of a delayed balst fireball into their books, if they did not have the room they would most certainly not erase an earlier stage of their magical understanding to do so. How could they erase on equation, when, that equation is in a sense a part of the greater. Okay I'm rambling on again and I have completely strayed from pen&paper rules, any way info on spell books can be found in a Dungeon Masters Guide if this didn't make sense to anyone.
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