system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5 why plywood has random eye shaped thingys in them

Why does plywood have random eye shaped outlines in them?
gpt
Likely you are looking at a paint grade of plywood. They cut the knots and imperfections out of the outside veneers and replace them with filler. This achieves the grade requirements. You usually will not find that on construction grade, and will never see it on a grade or stain grade.