There are no rules of architecture for a castle in the clouds.
—G.K. Chesterton
Remember the old saying, “Time is money”? Assuming a clock is a decent representation of time in motion, and a payment system is a way to move money, what is common between a clock and a payment system? The first things that come to my head are consistency and predictability. As much as you expect a particular behavior from your clock – displaying the precise time as long as it has a mechanical or battery power – you also anticipate very specific, preprogrammed ...
