When one can't replace the pine in the AC of Villa Tugendhat anymore

The moment a rudimentary material such as the pine wood in the air conditioning system of Villa Tugendhat – thinking of which one would rather consider the craft to process the wood to be endangered of obsolescence – is close to extinctions, that is the next to last point in time (before the material is just a memory), when change in the old world becomes evident; hence epochal transitions are fluent.