Page 48, 59
The first thing we notice, is, that all three spreads look completely different.
On page 20 and 21 we can see a composition which consists out of an image and a small text which describes what is happening in the image.
Pages 22 and 23 on the other hand consist solely out of a single image. However, on a closer look at the image we can see that both pages differ quite a bit from each other. While the rough shape of the building in the image stays the same, most details are completely different on the two pages. Only a drawn doorway connects the two pages in the middle. We can find the reason for all this on the previous pages.
Pages 48 and 49 only consist out of text.