Once a man wanted to build a strong house. He built a terraced house using bricks and steel. Later he went inside the house. It was very dark! It had no ventilation. To get light and air, he took a big vessel and held it outside the house. After sometime thinking that the vessel contained light and air he took the vessel in and poured the light and air in the house. He did this several times, but there was no light and air. A wayfarer saw him and laughed. He helped him get enough light. What might the wayfarer have done to get light and air? Explain in your words.