... To understand what their ups and downs are. Yet another example came to me recently. I was just reading my iPad on my couch, with the iPad on my legs - I didn't hold it at all. Why should I hold it?
So I remembered that discussion I had a few months ago with a colleague about the iPad before I bought it. He said: "that's a cool gear, but it weight quite a lot and must be tiresome to hold a long time, for things like reading". Of course, when you read a pocket book, you have to hold it. It's not a real problem because it's light, but one of the biggest reason you hold the book is to keep it open. But you don't need to keep the iPad open. So holding it is unnecessary. But who would have thought to that without trying?