Great minds! I was just about to add that to the Meg Poems thread. Including the bit that precedes it -
Very exciting. But I hope the diggers don’t come up with too many “solutions” to the mystery of Silbury and its inscrutable entourage of henges and barrows. To gaze on that prodigious pimple, especially with a mist swirling over the downs, is to feel both the ambition and the vainglory of Homo sapiens.
In a single word, what's the main appeal of Silbury? Mystery.