There is such a thing, I think? Mostly used on chalkboards in general, I think. But any pen can be used for art, if you try hard enough.

[ Yes, a photograph is a good idea. He'll take one in a moment. ]

It was muted, and yet alluring and alive in a way I did not expect. I highly recommend experiencing it for yourself. At least once, if not more times.

The sight may look different in different seasons - when the light is sparse in the Winter, or new and fresh in the Spring.