What Was the First Abstract Artwork?

I enjoyed reading this article because it was very informative and I learned things I didn't know before. I always thought abstract art was cool because I like that it allows the viewers to determine what they see with the use of lines, form, color and shapes. It gives the viewer freedom to think/make what they want of the painting. While this article didn't focus on one primary person whom created the movement, it rather talks about the multiple artists that contributed to it.