Need Suggestions...

1) Mix water with soap / detergent to get a solution suitable for blowing bubbles
2) Take two panes of transparent plastic, stick them together by placing 0.5cm high nails between them (like two panes seperated by 0.5cm with nails going through at certain spots)
3) Submerge the whole thing in the water/detergent solution
4) get it out, let the excess water drip away and you should get the shortest route between all the nails / dots drawn with a bubbly "wall / line"

^ practical use: draw a map of 10 or so major cities on a 1 foot* 1foot two-pane thing and you'll get the shortest route between the cities.

PS: you can thank me later, once you have the best fucking idea at the fair