I bring people together, usually by making them throw things at each other.

Roses are red, green means go. I’ll never change, so some don’t know. Even if I’m hidden in thicket, Don’t ignore me, that’s the ticket!

A pale blue hue, cast over the night. Depending on the calendar I might be bright.

I’m vivid at midnight, but faint by the dawn, you try to remember me, and I’m already gone.

I wipe away your past to clear the scene, A ghostly boundary, clinical and clean. I steal your identity, erasing every trace, To heal a wound or leave a hidden space. A thin, synthetic skin that feels no pain, I guard from sickness and wash out the stain. What am I ?