Canadian astronaut Bob Thirsk
![](/images/recherche//tiles/8d3d180e-c362-48a2-9285-b4e55d7d7bef.jpg)
2009-07-09 - Canadian astronaut Bob Thirsk performs the International Space University experiment IRIS (Image Reversal in Space). This experiment investigates the perception of two- and three-dimensional ambiguous figures in a reduced gravity environment. (Credit: NASA)
File size: 2.32 MB
Image size: 4288 x 2836 pixels
Resolution: 300 dpi
Photo taken on July 9, 2009
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