I love this concept! As someone who struggles with concepts of scale myself, I appreciate the attempt to make large ideas and numbers more understandable and relatable. However, I think it could have been executed better.
For me, the "Events of the Last 3000 Years" spread was actually more confusing than a standard timeline. The spread of "The Continents" is also confusing, mostly because South America is a smaller percentage (3%) than North America (4.1%), but the South American portion of the page actually looks large since it's a skinnier but longer rectangle. Similarly, the "Money" page seemed a bit misrepresentative to me: 1 man stands on top of a single stack of 40 coins, to depict 1% of the population having 40% of the money, while 9 people stand on top of 45 coins split into two stacks, to depict 9% of the population having 45% of the money. Technically, the 9 people are on top of more coins than the 1 man, but since the coins are split into two shorter stacks than the one single stack of the 1%-er, it appears at first glance to be fewer coins.
Overall, I think it's a good effort to introduce concepts of scale to kids, and I don't know of many other books that do so. But there's definitely some room for improvement.
Note: I received a digital galley of this book through NetGalley.