That Ball Can Look Out and Still Be in Play
Football's whole-ball requirement explains why an overhead angle can overturn your first impression.
The ball appears to cross the line from the television camera's angle. Play continues and a defender looks outraged. The visible patch of ground under the ball is not the whole test.
The entire ball must cross
IFAB Law 9 states that the ball is out when it wholly passes over the goal line or touchline, on the ground or in the air. A curved ball can overhang the field even when its contact point seems beyond the painted line.
Editorial image from Blogdel's sports collection, used for illustration.
Try a harmless tabletop demonstration: draw a line on paper and place a round object close to it. Move your viewpoint from the side to above. The apparent relationship changes without the object moving. Perspective can make a confident first glance unreliable.
Keep geometry separate from emotion
For a replay, ask whether the angle can establish the whole ball's position. A useful view must answer that specific question, not merely look dramatic. The goal-line rule adds other requirements for a valid goal, so a boundary decision is not every decision.
Once you understand the test, an official allowing play to continue becomes less mysterious. The question is not whether part of the ball crossed or whether it looked close. It is whether the whole ball passed beyond the line.
Editorial image from Blogdel's sports collection, used for illustration.
Sources and further reading
References
- Laws of the Game: the ball in and out of play | IFAB · primary