New work by Thomas Ruff on show at David Zwirner
The photographer continues to impress with 'Substrats' and 'Machines'
In the last decade, the profiles of the leading German artists have only increased, as have the prices of their art
Prices for Gursky, Struth, Ruff and Demand have rocketed in 10 years
Thomas Ruff retrospective begins a three-year tour
The German photographer compares his serial working method to “a scientist carrying out a series of experiments”