A short video about a small detail

Just wanted to show you an alternative method of rendering light details on a dark background. Instead of using art masking fluid as I usually do, I find the above technique results in the even edges I needed to depict fine straws of grass. You can't use the method everywhere but in this case I was pleased with the result. It's my own invention but there are probably many other artists doing similar things to achieve the same results.
Agatha Christie once said " I don't think necessity is the mother of invention. In my opinion invention arises from idleness, possibly also from laziness." Anyway whatever, it's the results that matter.