This book examines why Math professors and even High School teachers refuse to admit slant cut of cone is oval, not ellipse. By giving a psychology answer, more precisely, a psychopathology for why math teachers refuse to correct their mistake, subsequently students suffer in having to learn and be tested upon error laden math.
Cover A picture of a cone with a semi-sphere inside the right-circular cone and nearby a cylinder. I draw the two to your attention because cylinder and ellipse have 2 axes of symmetry, while the cone and oval have just 1 axis of symmetry.