"it finally produced itself in a day"
I haven't done any visual art (maps aside!) for a year or two now, but know from making musick that my best creations usually flow out effortlessly like that. The colours and shapes in your picture remind me strongly of the patterns on the surface of the river (wouldn't U know it!).
I'm glad my writing/ranting has been helpful to you, Rhiannon (indeed, I'm dead excited just to know someone's reading it!). Feel free (though not obliged) to mail - I'd be delighted to hear what you think. Callanish was "double cosmic" (as Holy put it)...
The river Knows!
TomBoo