And undoubtedly Greenaway's work does challenge observers to think again about their responses, to engage visually and rigorously with what is on the screen.
These turbulent times challenge the observer's ability to follow the dynamics of events to a point when the possibility to build a proper capacity for orientation, in order to acquire valuable knowledge about the future, has been compromised.
With the performance at Ringling, he continues to challenge the observer's perception of truth.
Represented by both works on paper and a painting, Feely's canvas challenges the observer to gravitate between perceiving the work through the prism of either positive or negative space.
His challenge, observers say, will be to unite the disparate members of the anti-Fernández opposition into a broad base of support.
That strategy has transformed what might have been a largely symbolic indictment into a serious legal challenge, observers said.
This motivation could come through the relevancy of the activity (Bybee et al., 2006), but this relevancy could be challenging for an observer to know, so it was excluded from our tool.
Sometimes, as she is assessing ballots challenged by observers for Mr. Miller, she pulls ballots close to her face and peers over her glasses.
They said many of the ballots challenged by observers for Mr. Miller were determined to be valid by Ms. Fenumiai, including those with the first and last name reversed.
Thomas Kuhn, Norwood Hanson, Paul Feyerabend, and others cast suspicion on the objectivity of observational evidence by challenging the assumption that observers can shield it from biases imposed by their "paradigm" and theoretical commitments.
