Hint Art

From SMO.wiki

Hint Art is a type of special object that appears in Super Mario Odyssey. The objects are photographs or graphics that hint the location of a Power Moon; however, the Power Moon that is hinted at does not appear in the same kingdom that the Hint Art is found in, although it will qualify as and appear as a Power Moon for the kingdom the Hint Art is in. The player is required to look at the Hint Art in order for the corresponding Power Moon to become available. The player can also use the capture feature on the Nintendo Switch to save the Hint Art in their gallery, though this is not required. Once Mario locates the exact spot of a hidden Power Moon as described in the Hint Art, he must ground-pound it to make the Power Moon appear out of the ground. In the Lake Kingdom and Seaside Kingdom, he can also reveal a Power Moon by attacking its spot as a Cheep Cheep. Only one piece of Hint Art can be found in a kingdom, aside from the Dark Side, which has ten different pieces of Hint Art. Hint Art does not appear in the Cascade Kingdom, in the Cloud Kingdom, in the Lost Kingdom, in the Ruined Kingdom, or on the Darker Side. Finding and solving enough Hint Art puzzles rewards Mario with two Power Moons from Archivist Toadette in the Mushroom Kingdom: one for solving five puzzles, and another for solving fifteen.

In addition to the in-game Hint Art, from March 14, 2018, to November 28, 2018, following the version 1.2.0 update, Nintendo posted new Luigi Hint Arts on social media.