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 It was very difficult for me to find a proper sample size for data intake

 but I polled seven girls from Rock 2nd 2nd when looking at the very first optical illusion we studied with Paul Grobstein.

First, I asked the ladies whether or not they saw a woman in the picture. They could respond with a yes or no answer. All of my questionees saw the women in the image.

Then, I asked them whether or not they saw a skull. Yes or no. All of my questionees saw the skull in the image.

Lastly, I asked how many distinctly separate images they saw within in the picture.  I had them count for this question and it was here that I had the most interesting responses. Six girls, all but one test subject, thought that there were two separate women in the image. Only one girl realized that it was a reflection of the first woman in the mirror. Additionally, none of the girls saw curtains in the nose of the skull as Paul explained last Tuesday in class. When I explained to the girls that the skull might not exist but be entirely a creation of their brain they were astounded and quite confused but understood the concept almost entirely after further explanation.