Chapter 6. Prototyping - Bringing Your Ideas to Life
"I don't explain, I don't tell, I show."
- Leo Tolstoy
Anticipating the success of a product is not an easy task. Human history is full of both successful and unsuccessful products. Although simple toys like the hula-hoop were a tremendous success, the swing-wing--a toy based on similar concepts--was not successful at all.

The Swing Wing was a toy designed to capitalize on the fun of moving your neck back and forth repeatedly. It was a big failure in terms of adoption, despite its similarities to the extremely successful, waist-moving hula-hoop (the preceding image was found from https://en.wikipedia.org/wiki/Swing_Wing_(toy), https://archive.org/details/swing_wing).
Every app starts from an idea, and you never know for sure if that idea will work in practice. Waiting until your product gets built in order to validate your idea represents a big risk--if things don't go as expected, you'll have little room to change course. It would be more...