As an inventor, you don’t just think of something in the bath. You go into the workshop and build prototypes, lots of them. Almost all of them are failures. We actually get quite excited when something fails. That’s how we learn. The cyclones on my vacuum cleaner took over 5,000 prototypes. That’s 5,000 failures before I cracked it. So our life is all about seeing problems that no one has tackled before and coming up with radically new solutions.