What is the purpose of checking a sketch upside down?

Correct answer: To observe shapes and angles without relying on recognition

The governing concept is objective observation. When a sketch is turned upside down, the subject becomes less familiar and the mind relies less on symbols such as “an eye,” “a face,” or “a cup.” Attention shifts to actual contours, angles, spaces, and relationships between shapes. Thus option D is correct. The method does not darken shadows, change the subject, or merely alter paper direction without improving observation.