The book fits the Kindle format perfectly. With one exception (the 10 fireflys are too dark) the illustrations work well in either the e-ink Kindle or on a color screen. I really enjoy having it when my son (now 1 yr old) decides that he wants to see what I'm reading and I pull it up so he can read and touch the screen. (Big advantage of e-ink Kindle over the iPad, the picture does not move when he touches the screen. Very helpful for counting)