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There are quite a few videos showing the technique on youtube. They are often called "zentangles" or "drawing paradoxes." This might be an easy way to make images for hive posts.

I drew this largely because I wanted to see how different inks worked on wax pencils. I did some elaborate pictures and ruined them in the drawing stage.

I was using a glass dip pen, which is messy. It looks like the patterns are best done with a technical pen on an plane surface. Many people use little sharpies.

As for paradoxes: For the most part they are amusing. Paradoxes show that there are limits to our ability to reason. Unfortunately, some political leaders use paradoxes to confuse the public and to trap people in double binds.