[MD] Ever-Changing Static Values!!?

[Craig Erb]

Your inorganic motorcycle constantly changes from one static pattern to another over time as its parts wear & get replaced; new gas, oil, & air are put in it; etc.  You might not even be aware of all of these changes.
Your concept of 'motorcycle' changes its pattern only gradually, if at all.  Originally it might have encompassed any motorized two-wheeler with handle-bars; later it might have included any vehicle with 2 wheels in back and one in front; now they have ones with one wheel in back and the handle-bars turn the two front wheels. 
Craig