The Lettera 32 (McCarthy's version) which was introduced in 1963, retains the same essential shape, but has square keys.
Apart from the jump in seniority, though, the essential shape – team reshuffle, challenge, boardroom, taxi for an annoying one – has scarcely altered across the decade.
It is here that the 30s take their essential shape: the surrender of democracy, the certainty of war – and the march to mass civilian death.
There has been an assumption that the US is the defining power, the one whose actions, good and bad, give the world its essential shape.
Many will feel, however, that the Archbishops overemphasize the issue of delegation whilst overlooking anxieties about the essential shape of the proposed legislation.
Greta is at a point where her life story seems to have settled into its essential shape: all its crucial twists and turns and accidents are behind her.
As ever, there's a freshly commissioned carol and we're promised carols in French, Spanish and German, but the essential shape of one of radio's great annual dramas remains untouched.
Applied mathematically to this metric, the Ricci flow acts like heat, flowing through the space in question, smoothing and straightening all its bumps and curves to reveal its essential shape, the way a hair dryer shrink-wraps plastic.
And we're reminded that Ms. Vogel did not write a tract or a diatribe but a mutable work of art that can be reinterpreted without losing its essential shape.
