signed in Chinese, signed again, and dated 'CHU TEH-CHUN 82' (lower right of the right panel);. titled in Chinese, titled again and dated '"Dynamisme Bleu I B" (diptyque) 1982' (on the reverse of the left panel);. titled in Chinese, titled again and dated '"Dynamisme bleu I A" (diptyque) 1982' (on the reverse of the right panel)