This Line Of Jagged Rocks, Surplus From the Dynamite Blasting, Are Used To Provide a Guard Rail.
….Metaphorically => The Narrator Says We Need Similar Protection From “Stylized Cars And Stylized Outboard Motors And Stylized Typewriters And Stylized Clothes.”

….“The nature of our culture is such that if you were to look for instruction in how to do any of these jobs, the instruction would always give only one understanding of Quality, the classic. It would tell you how to hold the blade when sharpening the knife, or how to use a sewing machine, or how to mix and apply glue with the presumption that once these underlying methods were applied, "good" would naturally follow. The ability to see directly what "looks good" would be ignored. .. The result is rather typical of modern technology, an overall dullness of appearance so depressing that it must be overlaid with a veneer of "style" to make it acceptable. And that, to anyone who is sensitive to romantic Quality, just makes it all the worse. Now it’s not just depressingly dull, it’s also phony. Put the two together and you get a pretty accurate basic description of modern American technology: stylized cars and stylized outboard motors and stylized typewriters and stylized clothes. Stylized refrigerators filled with stylized food in stylized kitchens in stylized houses. Plastic stylized toys for stylized children, who at Christmas and birthdays are in style with their stylish parents. You have to be awfully stylish yourself not to get sick of it once in a while.” (Cont. Next)

Metaphoric Bridge Connection:
… The ZMM Narrator discusses the importance of “ The ability to see directly what "looks good" would be IGNORED. “ which results in overwhelming “Stylish Technology Products”…. And, a river edge Guard Rail metaphorically connects to how we need for protection from => “ You have to be awfully stylish yourself not to get sick of it once in a while. ”

Salmon River Gorge, ID.
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(Photo = 111-1146cz2.0 ...... ZMM Page = 262 ...... WayPt = 286i3. Photo at 287w 1667ft) ************

Photo at 287w 1667ft, which is ~13 twisty river driving miles (10 miles straight line) South of White Bird, ID.