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They described their earlier times together as days of leaving post-it notes for each other rather than phone calls or modern-day text messages, and joked that time spent apart had helped them stay together.

She added: "I used to write messages on post-it notes and stuck it on the mirror. He he would see it and he could read it and he could answer it and did the same thing for me. That was how we got on."

Atkins and his team decided to generate the data themselves by counting the gender of contributors — initially on Post-it notes.

Text is visually presented on the screen in a host of ways — via roulette-wheel graphics, as post-it notes, as banners.

"When we were dating, people would stop him, and be like, 'You broke up with her on a Post-It!'"