If I had to compare my spending on books to one of the states of matter (solid, liquid, or gas) it would probably be gas, because my book-buying consistently expands to fill my bank balance. What I mean to say is that I just bought We Feel Fine: An Almanac of Human Emotion by Sep Kamvar and Jonathan Harris and it’s amazing. You can look at spreads from the book online and also play around with the wonderful application on which the book is based.