Open Goaaal! is a white football goal net surrounded by a wall of black netting. It hangs from 2 green metal poles that are 3 metres high, and opens and closes just like a curtain. It's completely made from ropes and netting and you can open and close it from whichever pole suits your yard.
Here's how you build it. Hammer the sockets into the ground. Screw the guy rope anchors into the soil. Erect the poles and hang the net. Then tension it into shape.