public Rtree chooseLeaf(Sprite Sprite) {
		Rtree expandTree = subTrees[0];
		expandTree.expandAmount(Sprite);
		int minAmount = expandTree.expandTotal;
		for (Rtree tree : subTrees) {
			tree.expandAmount(Sprite);
			if (tree.expandTotal < minAmount) {
				expandTree = tree;
				minAmount = tree.expandTotal;
			}
		}
		return expandTree;
	}