We checked for signs or symbols (nothing on the sky neither) that could be reflecting the lion shape (even when she was seeing it on her screen and I wasn’t) but found nothing.
We checked all houses and there are no chinese lamps at all in any of the houses around.
And if it was a lamp, how can it project exactly on that spot (with no lamps around outside nor inside of any houses)?
Oh! And as mentioned, if it was a lamp projection I should have seen it too (but there was no lion shape in the ground in my screen), and I was standing next to my partner.
The projection is from a light source, and lighting looks different on each game client, especially if you have different graphics settings. If you compare your screenshots to hers in the initial post, you’ll notice that everything looks different, not just the visibility of the projection.
In this case it looks like some combination of different lighting/shadow quality settings, and possibly you having your in-game brightness set so high that dark areas aren’t even visible.