
I painted this.
Then I sold it, which is great. But I missed it.
I liked it as an object to hang in my house. The colors seemed to help tie together all the rooms I hung it in. I like the message, that even freeways and municipal water management systems have their beauty. I liked hanging a portrait of my neighborhood.
So I painted it again. Is that self-plagiarism? Is there such a thing as self-plagiarism or is that simply self-improvement? Is it okay?

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http://www.telegraph.co.uk/culture/art/art-news/8666224/Leonardo-da-Vincis-Virgin-of-the-Rocks-paintings-united-for-first-time.html
Every artist creates his/her own tricks and riffs. Unless consciously repudiated, they inform the creative output. See Picasso's and Stravinsky's stylistic periods.