What do you see when you look at the image in figure 1? Do you see a bulging sphere that stretches the checkerboard pattern in the center, causing its lines to curve?

As Thomas Edison said, “Genius is 1-percent inspiration and 99-percent perspiration.” Perspiration may be boring, but it gets you results.

First published Oct. 1, 2013, on the CERM Risk Insights blog. © Umberto Tunesi and CERM Risk Insights.