The only marked event of the afternoon was, that I saw the girl with whom I had conversed in the verandah, dismissed in disgrace by Miss Scatcherd from a history class, and sent to stand in the middle of the large schoolroom. The punishment seemed to me in a high degree ignominious, especially for so great a girl—she looked thirteen or upwards. I expected she would show signs of great distress and shame; but to my surprise she neither wept nor blushed. Composed, though grave, she stood, the central mark of all eyes. (Jane Eyre)
I guess ‘composed’ has the function of participial phrase; ‘the central mark of all eyes’ has the same function. When noun phrase take the same role as participial phrase, what name do you call it?