What's the use of Goethe's paintings?

Furniture drawings can be used as furnishings.

There are seven hidden furniture drawings in the game, which are distributed in two NPC shops, and the positions of these two NPCs are very inconspicuous, so you can't find them if you don't pay attention. The first NPC is located in a chair in the grass at the entrance of the Westwind Knight in Mond. You can find an NPC man named Goethe, who is the owner of Goethe Hotel in Mond. After talking with him, I found that he actually sells four kinds of furniture drawings, namely, dead wood direction cards, hard-top lightning protection tents, simple single tents, and adventurers' temporary camps. The price is quite expensive. If you buy it all, you need 175000 molars.

Then there is the second NPC, located in front of the wooden house in the lower left corner of Qingce Village. You can see an NPC man named Lu Ye, who is the owner of this workshop. This place is a bit remote.