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左の図はその例です。図絵上には、

しらふであれ。無分別に信ずることのないよう心がけよ

と文字で書いてあります。図絵にある、目のついた手と地面のハッカの草という形は、その文字の内容を表しています。

この熱狂の影響は、いまでも残っています。図絵にカーソルをゆっくり当てて、それからクリックしてみてください。