There was no pride of ownership. Instead, our practice was to throw our ideas out into the space between us. Then we’d have at them — turning them over, rearranging them, even attacking them in favor of better ideas. The only thing that mattered was creating something richer, deeper, simpler and smarter. We both believed we could produce something better collaboratively than either of us could working alone. The joy when we nailed it felt magical. It never occurred to us to parse who contributed to what. Until, one day, it did.