Okay... I am on the last pages of the book, and I have come up to a pip…

Okay... I am on the last pages of the book, and I have come up to a pipe puzzle. Each time before I have tried to solve the pipes puzzles, and ended up skipping them. I have no more orbs to skip with, and I am stuck.

I have all the pipes aligned, all the loose ends plugged, but still nothing happens, the chest for the page does not open. I have to be missing SOMETHING, but I will be fussed if I can figure out what!

I know I am late to this game.. but please help!