Each individual’s youth faithfully repeats that of his forebears, introducing him to a role that lives on unchanged: it is a “pre-scribed” youth, which, to quote Mannheim again, knows no “entelechy.
By the same token, in most of the country transaction taxes have been cut by as much as two-thirds for people buying second homes; in the five outliers they have been left unchanged.
Also the horrifically energy in-efficient tungsten light bulbs that have remained unchanged for a century are giving way to CFLs and LEDs – greatly reducing the amount of energy required to light a room.
For example, after 6th century, German words starting with P, systematically shifted to a PF sound, while the Old English counterparts kept the P unchanged.