I don't think necessity is the mother of invention. Invention, in my opinion, arises directly from idleness, possibly also from laziness - to save oneself trouble.
You could say I was too lazy to calculate, so I invented the computer.
When we started work on the iPhone, the motivation there was we all pretty much couldn't stand our phones, and we wanted a better phone.
I wouldn't have launched 'Sharp Daily' without smartphones. Frankly, there's no reason for me to start another newspaper - it's a dying industry. But the smartphone is changing everything.
The computer industry began with home-brew boxes that everyone had to program for themselves, but that was a huge hassle. The computer revolution didn't explode until the first Macintosh arrived, with its point-and-click simplicity.
When Steve Jobs and Steve Wozniak created Apple computer in a garage in Palo Alto, it heralded the beginning of the PC revolution that ultimately dealt a death-blow to dozens of older companies.
Every good work of software starts by scratching a developers personal itch.
I invented the web just because I needed it really because it was so frustrating that it didn't exit.
When the Woolworth's-Hot-Fudge-Sundae switch goes on, then I know I really have something.
