Why was the Berlin Wall called a canvas of concrete

herodotus taught this. herodotus was an ancient greek historian who was born in halicarnassus in the persian empire. he is known for having written the book the histories, a detailed record of his "inquiry" on the origins of the greco-persian wars.

where is the passage

i cant solve it without knowing the passage

there is no image, therefore i cant you. next time remember to include an image or answer choice