So gravel is gravel. It falls when it doesn't have anything under it. Yet...it doesn't make sense how it can stack up to 128 blocks high. Its gravel...after all... So, is there a way that I can prevent things from stacking oh so much? For instance, if a player is trying to build a skyscraper, it must be made of iron because wood, or anything else, can only go so high. Or like those annoying dirt towers you see every now and then..