Impasto｜厚塗：顏料不必只負責顏色，堆得夠厚時，筆觸本身就變成會投影的三維表面
WHAT 這是什麼
Impasto is the application of paint in a deliberately thick, textural layer so that brush or knife marks remain physically raised on the surface. The resulting relief can catch light and cast small shadows, making paint operate as three-dimensional matter as well as color.
WHY HERE 為什麼屬於底域的世界
它把繪畫從純圖像重新拉回物件：顏料厚到某個程度後，畫面不只反射光，也真的開始靠高度製造陰影。
BLIND SPOT 補了哪一塊少看的視角
impasto 可用不同媒材與添加物形成，耐久性也依厚度、binder 與底層而變；「厚」不自動等於特定藝術風格或保存穩定。
