How many books does one person need - at any one time? I reckon probably less than 50. That includes cook books, design books, novels, travel books, language books etc. I mean if I'm stuck I can have any book on my desk within 48 hours.
Going through the book shelf again. Just a small gardening book that I picked up years ago for a few pence, again for the illustrations more that the prose. It's only now, after gardening for a number of years that I fully appreciate the text.