[Moonbreeze]

So are there any good Invariant patterns ideas around?

[danshawen]

"Invariant" is an interesting selection of terminology, for a number of reasons.

The following idea was not in Jeff's book (and it goes a very long way back indeed).

Let me preface the remarks by saying that I have managed and created (from scratch) calibration and metrology facilities that repaired and calibrated a wide range of laboratory equipment. When one does this, one is immediately struck by the relatively small number of metrology STANDARDS one needs in order to accomplish a calibration of physical measuring instruments, or even more complex instruments such as spectrum analyzers, network analyzers, and oscilloscopes.

All you really need for most calibrations is the instrumentation equivalent of a timebase (stopwatch) and a yardstick.

But the really interesting part is that if you really understand what relativity theory says, you may also entirely dispense with the TIMEPIECE! This is because time can always be converted to a length that is related to light travel time in a vacuum, removing the temporal dependence of all physical relationships to a dimensionless constant that is related to the reference frame invariant speed of light in a vacuum.

You heard it here first. The only thing you will ever need to calibrate any sensor or instrument ever invented by man is a meter stick.

Self-organizing memory such as our own neo-cortex (or a photograph or a video record) likewise serve to remove the dimension of time from our timeless memorys, perceptions and experiences. When we wake up in the morning, it is as though no time has passed between the time we fell asleep and the time we woke up. So the marking of time is obviously not a precondition for us, although it seems to be very critical to the operation of digital computer systems as they are engineered today. This is subject to change.