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1) Get shelves, I was an eBay bookseller as well as a book collector back in my country in Europe and stacking books is terrible for them.
2) Dust and silverfish will infest your floor books if you’re not careful.
3) Why are you stacking them so neatly? What purpose does that serve? If they’re meant for shelves, then it really doesn’t matter how neatly you stack them temporarily, but if you’re going to keep them on the floor like that, then it’s unpractical to see/get books you want from stacks and it’s just not good looking to have books in piles on the floor.