Tile, sea monster, fish, emerging from waves in blue, spinnekop as corner decoration, wall tile tile footage earth discovery ceramic earthenware glaze tin glaze, glazed fried Tile sea monster fish appearing from waves in blue spider head as corner decoration Fish represents whale with two blow holes at the top skull archeology Rotterdam Kralingen-Crooswijk Struisenburg's Gravenweg Oostmaaslaan indigenous pottery building material fireplace Soil discovery: Oostmaaslaan en's Gravenweg Rotterdam.