Tā de túdì huà de bǐ tā hái hǎo, zhēnshì qīngchūyúlán.
His apprentice paints better than he does - the student has surpassed the master.
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From 《荀子·劝学》: 青，取之于蓝，而青于蓝 - the blue dye extracted from the indigo plant is more vivid than the plant itself. Xunzi's metaphor for how learning can raise a student above their teacher.
