Hard to say

THE MIXED-UP MESSAGE by Heather and Ethan Long. Aladdin, 2013.

Max has some trouble
Expressing his feelings. But
Milo helps him out.

Letters of Protest

THE DAY THE CRAYONS QUIT by Drew Daywalt with illustrations by Oliver Jeffers. Philomel, 2013.

It seems the crayons have a little problem with their owner, Duncan. Beige feels unloved; red is overworked. Pink is definitely underappreciated, too. One by one, all the crayons express their feelings. Here is a concept book featuring epistolary format. Looking for rigor? Look no further.