I noticed that in various works of Japanese art, the artists sign their work with a seal whose contents range from fairly regular kanji to very abstract variations of kanji. I have also seen it used in calligraphy, as shown in the example below.
I heard that this is called "seal script", but no one has been able to point me to any more information on it beyond Wikipedia. Is there a name for this form of writing and better resources for learning about it?