A visit to any gallery will throw up plenty of examples of unfinished art.
The unfinished structure, a striking example of metaphysical architecture, was designed with no windows, doors, ceilings or floors.
There are also a variety of other small unfinished items including, for example, Braille characters on important signs in the building.
And an example of unfinished projects includes a grand plan to develop property at World Golf Village in Northern Florida for townhouses and a spa.
Germaine Greer begins The Whole Woman with a recantation, "it's time to get angry again", and fills 400 pages with examples of battles unfinished, freedoms yet unwon.
Just last month, during the illuminating offshoot of the Etonnants Voyageurs festival that Congo-born writer Alain Mabanckou and his colleagues organised in Brazzaville, I came across plenty of examples of the unfinished business that makes Achebe's work texts for life rather than just for study.
Typical examples of denumerably unfinished sets are the totality of countable ordinals, the points of the continuum, and in particular, as could be shown using Richard's paradox, the set of all definable points of the continuum (1907, p. 150).
"We have recently seen far too many examples of the unfinished work of racial justice in the brutal deaths of Black men and women to believe that the efforts of the Civil Rights Movement have been accomplished," Gregory said in an email to The Huffington Post.
The ongoing measles outbreaks and the high risk of polio for children in some countries in the region are stark examples of the unfinished agenda, which should have no place in 21st century Europe and Central Asia".
It had no immediate repercussions in his native Florence, although the example of his unfinished "Adoration" remained there.
