Although it's not an official Girlguiding badge, Stone hopes that the national organisation introduces something similar. He worries that some programmes designed to teach children how to design and code are outdated.
"After a while they can still be quite dry in terms of challenging youngsters —and it's not just girls — to motivate them, to think 'this is what I want to do'. But if you put them into a Japanese garden, or [on Mars], just looking at their faces really tells it all," Stone said.
"The great thing was that even the youngsters were asking intelligent questions. It wasn't just 'this is awesome', it was very much 'how does this work?'"