The Curse of the Black Spot sauntered off to other less interesting stuff," mainly criticising that the little girl's regeneration in "Day of the Moon" was left unresolved. However, Brew "still enjoyed" "The Curse of the Black Spot", reacting positively to the episode's production values and the reveal of the black spots. Nick Setchfield of the science-fiction based magazine "SFX" opined that the high points of the episode were that it was "high on shivery maritime atmosphere," and the Doctor for not being "in instant possession of all the facts, but who reloads his thinking as events unfold." However, Setchfield was critical of the story, claiming
Dynamical billiards Dynamical billiards A billiard is a dynamical system in which a particle alternates between motion in a straight line and specular reflections from a boundary. When the particle hits the boundary it reflects from it without loss of speed. Billiard dynamical systems are Hamiltonian idealizations of the game of billiards, but where the region contained by the boundary can have shapes other than rectangular and even be multidimensional. Dynamical billiards may also be studied on non-Euclidean geometries; indeed, the very first studies of billiards established their ergodic motion on surfaces of constant negative curvature. The study of billiards which are