Harriet, I never thought to sort books according to light or dark. I put the same subjects together, like all the cookbooks in a row, DH's auto manuals, etc. and then I sort those by size. Usually, like subjects tend to be the same size. BWTG on your work.
So in an ongoing effort to keep purging stuff DH has begun bringing home
I took a big pet carrier he saw laying somewhere and brought home. I just hate that he's begun doing this and I've asked him please to stop. Anyway, I drove past a thrift shop and donations were all just sitting out on their porch so I added the carrier. I'm sure at some point he will ask what happened to it. He just is annoyed at people throwing away perfectly good stuff.
He did stick an ad in a website and someone came and took away the bike he brought home. I feel like I'm fighting a losing battle around here.