What do you call a ball hit with a long , high arch into either back corner of the court ?
This rule is both as complicated as it is critical to the gameplay , and those attempting to play may not quite understand it at first but it will become obvious soon after playing a couple of rounds ( think " I Know It When I See It " from Supreme Court Justice Potter Stewart 's opinion in the landmark 1964 case involving what should or should not be considered obscene — you 'll just know it ) .