It does not happen often, still sometimes one thing or another happens and I lose power on my computer in the middle of painting.
Like tonight.
Oh, The file icon is still there, but when I try to open it I get an "unexpected end-of-file" message.
The art I worked so hard on, simply ceases to exist. As though it were one of the paintings I have worked on in my dreams. (Yes, there have been many of those as well.)