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At the first stages, all the participants in Guilford’s original study censored their own thinking by limiting the possible solutions to those within the imaginary square (even those who eventually solved the puzzle).

Even though they weren’t instructed to restrain themselves from considering such a solution, they were unable to “see” the white space beyond the square’s boundaries.

Today many people are familiar with this puzzle and its solution.

The first group was given the same instructions as the participants in Guilford’s experiment.

Guilford was one of the first academic researchers who dared to conduct a study of creativity.

He challenged research subjects to connect all nine dots using just four straight lines without lifting their pencils from the page.

The second group was told that the solution required the lines to be drawn outside the imaginary box bordering the dot array.

In other words, the “trick” was revealed in advance.

453 comments

  1. Olds Serial Numbers and Dates for Trumpets and Cornets. An early 1945 date would be. A serial number list from 1952 until the end of production was provided.

  2. F. E. Olds and Son Serial Numbers. they create some uncertainty for manufacture date of trumpets/cornets in the 70,000. Selmer/ Bach purchased tooling for all.

  3. The Bach Legend Guide to Dating Trumpets, Cornets Please use this chart in determining the approximate age of Bach trombones based on serial numbers.

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