When you open your Tome you will see that you have a new chapter: Exploration. Double clicking (or scrolling) this will enter the chapter and give you more boxes:

This chapter opens up a lot of new items to craft and a few abilities. Be sure to place your Luminous Crafting Table with a view of the sky because you will need it to craft your next item, the “Lightwell”. You will also need a few buckets and more marble.