>>100250560The pebble knows where Biboo is at all times.
It knows this because it knows where Biboo isn’t.
By subtracting where Biboo is from where Biboo isn’t, or where Biboo isn’t from where Biboo is (whichever is greater), it obtains a difference, or deviation.
The pebble’s guidance subsystem uses deviations to generate corrective commands to drive the pebble from a position where Biboo is to a position where Biboo isn’t, and arriving at a position that Biboo wasn’t, it now is.
Consequently, the position where Biboo is is now the position that Biboo wasn’t, and it follows that the position that Biboo was is now the position that Biboo isn’t.
In the event that the position that Biboo is in is not the position that Biboo wasn’t, the pebble has acquired a variation; the variation being the difference between where Biboo is and where Biboo wasn’t.
If variation is considered to be a significant factor, it too may be corrected by the pebble’s guidance subsystem.
However, the pebble must also know where Biboo was.
The pebble guidance computer scenario works as follows:
Because a variation has modified some of the information which the pebble has obtained, it is not sure just where Biboo is.
However, it is sure where Biboo isn’t, within reason, and it knows where Biboo was.
It now subtracts where Biboo should be from where Biboo wasn’t, or vice versa.
And by differentiating this from the algebraic sum of where Biboo shouldn’t be and where Biboo was, it is able to obtain the difference between its deviation and its variation, which is called error.
