Challenge 2: A Grid Texture Looking Stretched and Warped in One Area — Solution Walkthrough

The answer:

Per this chapter's own warning box, this is exactly the distortion
problem it describes — poor seam placement, or an uneven UV layout,
causing real, visible stretching and distortion once a texture is
actually applied. The grid pattern's own straight lines make this kind
of distortion especially obvious, since any unevenness in the
underlying UV mapping bends what should be perfectly straight lines.

Why this isn't a problem with the texture itself:

The grid texture is a flat, evenly-spaced image with no distortion of
its own. The visible warping comes entirely from how that flat image
gets mapped onto the 3D surface — wherever the UV layout stretches one
area more than another, the texture stretches right along with it,
exactly as this chapter's own material describes.

What this reveals about the underlying UV work:

Per this chapter's own material, this isn't a rare edge case but a
common, genuine source of disappointing texture results, specifically
motivating the recommendation that thoughtful seam placement — not
just running an automatic unwrap and moving on — is a real modeling
skill worth developing.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that visible texture stretching is correctly
traced back to uneven UV mapping or poor seam placement, not a flaw in
the texture image itself.