private void initializeElements() {
		int number = ElementType.values().length * 10 + (GameModel.UNIT * 10);
		for(ElementType type:ElementType.values()) {
			for(int i = 0; i < number; i++) {
				model.addElement(new Element(type,
						getRandomLocationOnGrid(GameModel.GROUND_LEVEL + 25)));
			}
			number -= 10;
		}
	}