What Do These 2 Books Have in Common?

Both of these books came out this fall and I illustrated both of them.  I don't think I've ever worked on two projects so drastically different at the same time before, but it was an interesting experience. Each book definitely used up a different area of my brain and when I was frustrated with one the other was a nice change of pace. BTW, I did not illustrate or design the cover for the Innovation book.

A page from "It's Halloween Night" written by Jennifer O'Connell...

A page from "The Dawn of Innovation" by Charles R. Morris....