We know where it came from and how it was made, and when we take it home or give it to a friend we know where it went. "Throwing" a pot once or twice a week can help relieve some of the pressure that the previous 6 days of school or work built up.
「有一次，我被老闆刮了一頓，心裡很不是滋味，又不能當面翻臉，就到這裡，把泥巴又摔又打，最後做了隻爛皮鞋。」