Thanks for the answers guys! (keep em coming=)
KnotMe: a shoelace knot is a funny idea, haha, thanks.
SS369: classics , very nice!
roo: thanks , solid suggestions , I agree the Trigger Bend looks great , might be a bit much for the thick rope I'm using though, I'll give it a try.
wysper: thanks and exactly, these knots are symbolic rather than educational, I'll ask some elders about the history of the place, but I think there aren't any specific trade related knots tied to the aria. A Reef Knot and a Carrick, for example, are recognised everywhere, perhaps not by name nor attributes but they have a timelessness about them and are so pure and simple, and beautiful.
Dan_Lehman: I hear you Dan, thanks for the suggestions. Indeed a knot with hidden ends would look good but this time I want to emphasise the joining of two, and how a knot holds them together through a simple and beautiful structure. The ends wont be a serious safety hazard, I think, no more than a fence pole or a decorative what ever that one finds in public parks (I'll also grind and sand the ends a bit so there wont be any sharp dangers). The sculptures will be placed near a pond in the park so people will always approach them from the same direction, facing the front side of the knot (unless they've jumped in the pond and swim towards them!). Thank you so much for you thoughts though, these ideas might be useful for another project!
Ok, have a great day and thanks again.
All the best, B