Décor and ambience
The Lighthouse at Penmarc'h
In the room
The Lighthouse at Penmarc'h goes behind the counter. It adds +1 ambience to the shop, whatever it was paid with. See ambience.
Part of The gallery wall with Enamel Wall Clock and Harvest Wreath: owning the whole set pays 5 pearls once and adds +2 ambience.
Spoiler Another way to get it
It can also arrive as a present on day 8 of the story. If you already own it, you get its price back in pearls.