So I was messing around in mc-central.net (SPONSOR), and I went to creative, and decided I wanted to lag the creative world with minecarts and troll other plots. This did not work, but I got the inspiration for an amazing project. As I was trying to lag the world out, the minecarts formed a wall in the plot pathways. I had the greatest Idea to go on a singleplayer superflat world, and try the same device over again. It had the same outcome. So, I created walls, and then created this! with a little help from commands to mass produce minecarts, I was able to complete it. This map features the original device, and the actual wall. CARFUL, DON'T FLY INTO IT! You need at least 4 GB of RAM to run this world, as I have the same amount, and I'm barely surviving the lag. any lower than 4 may result in crash. HAVE FUN! and don't forget to check out mc-central.net!