This is a detail of the engine block at the interface with the exhaust. I call it “Totem” for, I think, obvious reasons. I did just a little teasing in Photoshop to brighten the washers (I suppose they are washers) around the bolts.
Speaking of teasing, I realized yesterday that I’d forgotten a crucial exchange in my recent post God’s name is George, so I felt compelled to rewrite the ending (for those of you who read the post and are interested). Like Dave Barry, I didn’t make it up.