Passage Summary: We make single-color sculptures today because we saw ancient statues without color and assumed that's how they were meant to look, not realizing the paint just wore off centuries ago.

Conclusion: The monochromatic style of most modern sculpture is the result of a historical misunderstanding.

Reasoning: Ancient sculptures were found without color, leading people to believe they were originally uncolored, when in fact the paint had simply washed away over time.

Analysis: The argument relies on a causal link between the discovery of the ancient statues and the choices made by modern sculptors. For the conclusion to hold, it must be true that modern sculptors actually intended to imitate the appearance of those ancient sculptures. If modern artists chose a monochromatic style for purely aesthetic reasons unrelated to ancient history, the 'misunderstanding' wouldn't be the cause of the modern style. Look for an assumption that bridges the gap between what was discovered and why modern artists do what they do.