What Dr. Seuss Books Were Really About

After reading What Dr. Seuss Books Were Really About, I'd like to add a few additional possibilities. Horton Hears a Who, in addition to being about isolationism, could also be anti-abortion. Thidwick, the Big-Hearted Moose is obviously about excess government spending. As far as mathematics is concerned, On beyond Zebra could only be about transfinite ordinals. (“My numbers start where your numbers end…”)