Though the piece is titled “Sunset At Montmajour” and the structure in the background is likely Mountmajour Abbey, it still bears a striking resemblance to the TARDIS — a ridiculous coincidence, since the Doctor visited Van Gogh back in a 2010 episode ...Is that a Cyberman waving to us just in what I'll call the top right corner of the lower left quadrant? Squint, and you can't miss it.
Squint harder ...