What is a 'good' abstract art?

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My question is pointed toward abstract art, but shouldn't I question art as a whole?
True art, is from the sole and a feeling the artist might have. As individuals, we all have different feelings and emotions. Think of the comments that were made about the impressionists of the 1800's...
So art is art and no matter if it's dripped paint or a specific placement of a brush stroke. It's all about the love and passion of what is inside of you and what you do. To be able to express yourself with no boundaries is what art is made of.

I was told by a art professor "do what makes you happy...art has no boundaries that's the beauty of it...its an expression and best therapy out there"

Ultimately, art is created by the mind of the artist, for perception by the viewer, is it not?

What do you think?

Here is some colorful inspiration to start the week!

Thank you for support!