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With sand casting, it is comparatively simple to handle design changes by changing the mold by modifying the pattern or core boxes, which are often made of wood).

Patterns of Meaning: The Art of Industry features salvaged enormous wooden casting patterns from old steel mills used in the late-1800s and early-1900s.

This article is more than 3 years old. Large wooden moldmaking patterns for steel casting, one of the displays for next week's The Patterns of Meaning art exhibit in Pittsburgh.