middle index, and choose that point with List Item. If even, for example 4 points (0, 1, 2, 3), you'll get 2, so subtract one and choose those two indices, 1 and 2. I only had a few minutes to play with this, so it isn't a fully-baked solution, but it should take you a little further.…
then it's settled, i'm getting a second one!
think i'll go with a 5:4 or 4:3 aspect ratio though, to save some desk space
thanks to all for your input!