Scalable stents / industry design

Nowadays there are a variety of phone holders selling on the market, and I was thinking if there were some holders are good looking, easily handling and convenient for us to read books. Therefore a telescopic shaft book rack is coming out my mind. As you can see, this rack is easy to carry, people who see it will probably consider it as an usual pen. However, it looks like a pen, but it can stretch out its length to suitable for the book’s size. When its length was shorted to the minimum, you can use it as a phone holder, which is also convenient for you to watch movie on phone.