The trick for the canniest collectors (or their agents) is to spot the nuances that make one picture more prized than another.
What we find is a more complicated picture than the one presented in the technology pages and adverts, where people who do not care very much for computers or the internet are using the network in their daily lives.
After every event, there's a small throng of people waiting to ask one more question, get an autograph or have their picture taken with the leading GOP candidate.
Despite the flaws, the overall picture is one of a health service providing more, better and prompter treatments for patients.
And he says the picture of a more diverse crowd is one England's 2018 World Cup bid will be keen to impress on Fifa's inspection team, currently touring facilities in the country.
With a more accurate picture of whether dud loans to one country or industry should go hand-in-hand with dud loans to another, banks should be able to spread their lending risks more wisely.
By studying more than one gene at once, researchers hope to get a better picture of how they work in concert to produce an organism.
The national figures show an improving picture - with more children given their first choice place, more getting one of their top three places and more getting at least one of their chosen options.
To focus on one pre-tax loss figure is to miss a much bigger, more complex and more interesting picture.
The project also found that using multiple measures to understand a teacher's performance -- including classroom observations, student surveys and growth in student achievement -- provides a richer and more reliable picture of a teacher's strengths and areas for improvement than any one measure alone.
Until the economic picture is more even, national differences will remain a part (albeit a shrinking one) of Europe's investment equation.
But if you look at data from the US Energy Information Administration (EIA) you get a much different picture, one in which Saudi Arabia currently produces about 1.2 million barrels a day more than Russia.
One of the best studies available, appearing last year in The New England Journal of Medicine, tells a more complicated picture.
One of the most troubling aspects of the unemployment picture in the U.S. today is the fact that more than 4 million Americans have been out of work for more than a year, and more than 2 million have been jobless for more than 99 weeks, which means their jobless benefits have run out.
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