Hop on an elevating gurney at the library and cruise down the aisle without having to tilt your head to look at book titles. This also allows you to have a comfortable reading place once you've grabbed the book you want. Another advantage is that it allows bookshelves to be much higher.
-- lingamish, Aug 14 2006

Bookshelf Rotator Glasses Bookshelf_20Rotator_20Glasses
This was my original idea that turned out to be redundant (See Bookshelf Periscope) [lingamish, Aug 14 2006]

random, halfbakery