Ha-ha's were used to protect a building from animals and people. It is said to be called a ha-ha because it would surprise people coming near it and make you cry "Ah! Ah!" We have teamed up with the The National Trust for today's challenge and we are inspired by the big ha-ha surrounding Seaton Delaval Hall.
Upload all you ideas to our website and let's invent ways to get across a ha-ha!