A Wonderleaf question

a real page from the book
The Great Wall of China was built by many workers over many centuries, using local earth, brick, stone, ramps, ropes, and simple lifting tools. Different rulers joined and rebuilt sections, so the wall grew piece by piece across mountains, deserts, and plains.
Its builders used whatever the landscape offered. In some places they packed earth hard; in others they made bricks nearby or carried stone along ridges. Watchtowers turned the wall into a warning system, with smoke and fire signals moving news from tower to tower.
Build a short wall from cushions or books, then add towers and test how a message could travel along it.
Watercolour scenes, straight answers, about three minutes cover to cover.
Open the picture bookOne more wonder: Why is space so dark?
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