@EventHandler
    public void onPlace(BlockPlaceEvent event) throws InterruptedException {
        ItemStack a;
        if (event.getBlock().getType() == Material.WOOL) {
            int i = 0;
            for (i = 0; i < 15; i++) {
                a = new ItemStack(Material.WOOL, 1, (byte) i);
                event.getBlockPlaced().setType(a.getType(), true);
                a = null;
                wait(2000);
            }
            i = 0;
        }
    }