From Vincent van Gogh we have over 900 paintings as well as over 1000 drawings.
He made nearly all of them during the final five years of his life. 365 times 5 would be just over 1800 days for those 900 paintings. Let's call it a painting every other day for half a decade.
How many did the aspiring artist with connections to the art market sell? None.
Comes now the news that beneath a quickly executed "Patch of Grass" reminiscent only in the most generic way of Dürer's Great Piece of Turf, some helpful particle-accelerated synchrotronic X-rays have revealed what was known to be there (thanks to infrared reflectography), but had previously not been seen: an early portrait, from Vincent's days as an evangelist among the coal miners.
This won't change our conception of the artist much, unless it be with regard to his second thoughts, but it's nice to see further confirmation of his early stylistic tropes.