/**
     * Determines the amount of enchanting power this block can provide to an enchanting table.
     * @param world The World
     * @param pos Block position in world
     * @return The amount of enchanting power this block produces.
     */
    public float getEnchantPowerBonus(World world, BlockPos pos)
    {
        return this == net.minecraft.init.Blocks.BOOKSHELF ? 1 : 0;
    }