His second Yamamoto adaptation "Robo no Ishi" (The Wayside Pebble) became Tasaka's representative masterpiece reflecting his sincere personality brimming with humanism.
同じ山本原作『路傍の石』の二作品は、ヒューマニズムに貫かれた田坂の誠実な人柄を反映した代表的傑作となった。