Stripes and Glow
Humans have stripes and we display bio-luminescence. True story. Of course it was Japanese scientists who proved the glowing bit. But this lends itself to all sorts of fun interactions with aliens. Human eyes can't see the stripes or the glow but what if we met a species that could? What would art in alien galleries look like?
Betty Adams is an up and coming author with a bent for science and Sci-fi.