What the latest experiment proves is not that creativity lacks any association to thinking outside-the-box, but that such is not conditioned by acquired knowledge, i.e., environmental concerns.
In other words, the difference could easily be due to what statisticians call sampling error.
your conclusion: that the second experiment disproves the theory that thinking outside the box is useful in solving problems, is itself a fallacy.
it only proved that telling someone to 'think out side the box' is, in most cases, ineffective.
That this advice is useless when actually trying to solve a problem involving a real box should effectively have killed off the much widely disseminated—and therefore, much more dangerous—metaphor that out-of-the-box thinking spurs creativity.
After all, with one simple yet brilliant experiment, researchers had proven that the conceptual link between thinking outside the box and creativity was a myth. But you will find numerous situations where a creative breakthrough is staring you in the face. *From Inside the Box: A Proven System of Creativity for Breakthrough Results Copyright 2014 Drew Boyd There are many theories of creativity.