#panel

The long, low shape is the giveaway, apparently: pictures built this wide were often part of the furniture — a bench back, or the panel set above a bed — rather than something hung by itself. There are wasps up in one corner that some people read as a pun on a family's name.

This is one panel out of four on what happens after you die — the other three are a lot less pleasant, and they were probably the wings of something bigger that's since been broken up. Wikipedia says not everyone is convinced he painted them at all.

There's been an argument since the 1890s about whether this is really his hand or a follower's — one big research project came down on 'follower' and the museum that owns it flatly disagreed, so it now sits in a sealed case with the question still open. It's oil on wooden panels, and the Latin ringing the middle supposedly translates as something like 'beware, beware, God sees'.