got books?

The other day, one of the top shelves in my bookcase collapsed. I'm sure it had nothing to do with certain animals trying repeatedly to get up there. I put the shelf back and rearranged the books, leaving a gap. Both Koa and Theo have figured out how to get up there and they relish being in that high space. I must say they have good taste (or limited options) -- this particular shelf holds books and manuals for which I am either author or co-author.