Bouncing Ball in Triangle

Topic:Incircle or Inscribed Circle, Orthocenter, Triangles

For every acute triangle, there is a path so that a ball can bounce indefinitely. 1. What is the relationship between point H and triangle ABC? 2. What is the relationship between point H and path of the bouncing ball?

Reference: https://en.etudes.ru/sketches/billiard-trajectories/

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