筆插在架 A Peak Like A Writing Brush
不數里,忽見一座筆峰。何以謂之筆峰?那山頭上長出一條峰來,約有四五丈高,如筆插在架上一般,故以為名。不数里,忽见一座笔峰。何以谓之笔峰?那山头上长出一条峰来,约有四五丈高,如笔插在架上一般,故以为名。
逐句解 Line by line
Not a few lǐ on, they suddenly saw a Brush Peak.
不數里 is the same not-a-few-lǐ that opened the old man's appearance much earlier, and it does the same work: a short distance, and then something.
Why is it called a Brush Peak?
Six characters of the storyteller asking his own question. This is a performance habit — set the audience wondering, then answer at once — and the novel uses it whenever a name needs explaining.
On that mountain top a single spur has grown up, some four or five zhàng high, standing like a brush set in its stand; and that is how it came by the name.
長出 keeps 長 as zhǎng, to grow. A 丈 is about three metres, so the spur stands somewhere between twelve and sixteen metres. 筆插在架上 is a writing brush stood upright in its rack, which is exactly what a scholar's desk looked like. 為 is wéi, to serve as.
Three units and the novel has invented a place, explained its name and moved on. This is scene-setting at its most economical.
The comparison is worth noticing for what it says about the audience. A mountain spur is likened to a writing brush in its stand — an image that assumes everybody listening knows what a brush rack looks like, which by the Ming everybody did.
And the storyteller's own question in the middle is the seam where a written novel shows its spoken ancestry. Why is it called that? Because it looks like this. The audience is being talked to.