So one of the supernatural elements in my urban fantasy story is a system of "aura-syncing" that explains how various supernatural abilities extend to one's clothes and belongings. A full explanation can be found here.
Tl;dr: Every human projects an invisible aura 3 inches from their body, and any solid object that spends 5 minutes completely encased in this aura becomes "synced" to that aura and is treated as a part of their body for the purpose of various abilities as long as it's at least partially within their aura when that ability is used. The aura an object is synced to will be changed again the next time it spends 5 minutes encased in a new aura.
Now, the main character is one of a few people on Earth who has the ability to see these auras. When he uses this ability, the entire world turns pure white with these sort of cell-shaded borders, and the only things that have any color are human auras and any objects that have been synced to an aura. Every person's aura actually has a color assigned to it, which can be absolutely anything except white (or any color too close to white for the average human eye to distinguish), though darker colors are rarer. And the main character will see any synced objects as being the same color as the aura of the person it's synced to.
Now, the fact that this applies even to the tiniest particles or grains of sand is a pretty crucial plot point, and it got me to start imagining what a beach would look like in this "aura vision", with every single grain of sand a human's ever sat near for five minutes being imprinted with that human's unique color.
Right away it sounds like a really striking image, with a technicolor pattern of human bodies imprinted into the sand from all the beachgoers lying down on it, slowly eroded by the sand being kicked around until the colors mix together, only to all be re-imprinted again. But I was wondering if there'd be anything else to the picture.
Is there anything about how sand moves and scatters on a beach that would cause other patterns to emerge, or anything else that would affect what my protagonist would see?