Can’t take credit for that Mr B – others have already suggested it. What makes the Seahenge stump so special is that it was placed upside-down in the earth with its roots facing outwards and skywards. It was then surrounded by a tightly closed circle of 55 split logs (flat side in, round side out) with one V-shaped trunk (a kind of gate) which was then closed with another trunk.

The impression the whole thing gives is of a place closed off at ground level but open to the sky. Given that the site was so close to the sea (and seabirds) the excarnation theory makes pretty good sense.