Another medium he uses for awakening perceptual powers is the scrim, which fluctuates between opacity and transparency.
As a writer, Arreola's trademark was his humour, which fluctuated between the witty and the cosmic.
Together, the men have preserved Perrotta's tone, which fluctuates between slightly satirical, even mischievous, irony and the most generous sympathy.
Between the two lies the great trade-route city of Sukhothai, possession of which fluctuated between the north and the south.
The Wellcome Trust disburses about £700m a year towards global health and science: a figure on a par with the Gates Foundation's annual spending on global health, which fluctuates between about £800m and £1bn each year.
"Instead, we saw an absorbing day's play which fluctuated between the two teams and, by the close, Warwickshire will probably have felt reasonably satisfied.
Rihanna's Umbrella dominated in 2007 - even though the tune's lyrics mirrored the year's tumultuous weather conditions, which fluctuated between flooding and drought.
On 30 September 1986, the rainy seasonal flow was 16100 cusecs, which fluctuated between 28,773 and 53,595 cusecs in 1997 and 1998 respectively.
In his introduction, he writes: "It is, perhaps, not surprising that the deep-rootedness of sectarianism in Scotland has led to a culture which fluctuates between silence and sensationalism, while other equality issues have been driven forward in a more holistic and coordinated way.
