What is affected if two middle values in a value scale are identical?

Correct answer: Gradual value progression

The governing concept is gradual value progression from light to dark. In a well-made value scale, neighbouring steps should show small but visible differences, creating a continuous transition. If two middle values are identical, one tonal step is repeated, so the progression loses its regular sequence and the gradation becomes less accurate. Therefore, option B is correct. The paper’s texture, the cast-shadow direction, and the pencil’s hardness are not changed merely because two painted or shaded values match.