anchor.diff:              final pathway = Pathway.arc(
                 position: position,
                 width: width,
  -              radius: math.pi / 2,
  +              radius: 100,
                 angle: math.pi / 2,
               );
               await game.ensureAdd(pathway);
  
positive.code:             final pathway = Pathway.arc(
                position: Vector2.zero(),
                width: width,
                radius: math.pi / 2,
                angle: math.pi / 2,
              );
              await game.ensureAdd(pathway);
  
negative.code:           final pathway = Pathway.arc(
              position: Vector2.zero(),
              width: width,
              radius: 100,
              angle: math.pi / 2,
            );
            await game.ensureAdd(pathway);
  