Actually, I can see that now.

I zoomed my browser a bit and it seems to be pretty convincing that it says WHARKS.
Who'da thunk it?
As it's been said before, it's probably just another one of those tiny little extras that pop up every now and then. I thought just now, I heard an almost imperceptable chuckle of a Cyan graphics artist echoing from a far distant age. "About time"...
Considering the bottom view of the Relto wardrobe issued sandals, posted by Annabelle, and considering that "Zandi at the Cleft" "could be" considered just another avatar, it makes sense that artistic liberties were probably taken with the sandals, "just for the fun of it."
In 20 years or so, of being around all things MYST, it has proven one thing beyond a shadow of doubt.
It pays to be observant during all aspects of gameplay even if it's just for something fun. 