The Human phrase of “eyes being the window into the soul” is bull. Its not scientifically possible.
At first they wondered, how can you tell exactly what others are feeling, just from their eyes? How?!
They’re just eyes. Nothing special. Humans eyes aren’t even as big as the Zoor’garth or as many as the Thenns of a thousand eyes. They can’t even change colour like the Datten!
That was what Zar think as well. Their friend Rachel had brown eyes that didn’t do anything special. Of course, like always in a story like this, they were proven very very wrong.
It was after they had become close “friends” as Rachel called that Zar would notice something more.
Rachel eyes would gleam when she ate her favourite snacks or when something funny happened. The colour remained unchanged but they reminded him of moons when they gleam with something. Curved into two tiny crescents.
They would glint. Like a spark has been set off, when something catches her interest. Almost like a predator catching sight of prey, he realised with a shiver. Her eyes would narrow down slightly and they would sharpen.
Funnily enough, it seems that Zar was the only one who noticed the subtle movements. Maybe it’s because as Rachel had said, they were “best friends forever” and had been granted special privileges. Or maybe it’s because he made spent more time with them.
Whatever the reason may be, Zar himself doesn’t really care much. Rachel is still Rachel.
In the end, it’s just one of those things that make a human human. Best not to think about it too much, lest he becomes like one of those crazy human-booklet scientists.