So, the Hubris repo itself will show a bunch of that history, but in particular, Cliff used the "sketch" nomenclature for the earliest ideas. I think in those

So, the Hubris repo itself will show a bunch of that history, but in particular, Cliff used the "sketch" nomenclature for the earliest ideas. I think in those first days, our thinking was that we were hitting a bunch of headwind on other approaches -- and had an increasingly concrete idea of what our own alternative might look like. I think whenever doing something new and bold, you want to give yourself some amount of time to at least get to an indicator that the new path is promising. For Hubris, this period was remarkably brief (small number of weeks), which is a tribute to the tremendous focus that Cliff had, but also how long some of the ideas had been germinating. Cliff also made the decision to do the earliest work on the STM32F407 Discovery; we knew that this wouldn't be the ultimate hardware that we would use for anything, but it is (or was!) readily attainable and just about everything about that board is known. To summarize, it didn't take long to get to the point where Hubris was clearly the direction -- and a working artifact was really essential for that.