What is hidden in 3D image?

There were these two elderly people living in a Florida mobile home park. He was a widower and she a widow. They had known one another for a number of years. Now, one evening there was a community supper in the big activity center. These two were at the same table, across from one another. As the meal went on, he made a few admiring glances at her and finally gathered up his courage to ask her, "Will you marry me?"

After a dramatic pause and precisely six seconds of 'careful consideration,' she answered. "Yes. Yes, I will."

The meal ended and with a few more pleasant exchanges and they went to their respective places.

Next morning, he was troubled. "Did she say 'yes' or did she say 'no'?"

He couldn't remember. Try as he would, he just could not recall. Not even a faint memory. With trepidation, he went to the telephone and called her.

First, he explained to her that he didn't remember as well as he used to. Then he reviewed the lovely evening past. As he gained a little more courage, he then inquired of her, "When I asked if you would marry me, did you say 'Yes' or did you say 'No'?"

He was delighted to hear her say, "Why, I said, 'Yes, yes I will' and I meant it with all my heart."

Then she continued, "And I am so glad that you called, because I couldn't remember who had asked me."