What is hidden in 3D image?

Stereogram - 3D Image

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A mother-in-law sent two ties...

A mother-in-law sent two ties to her son-in-law. Some weeks later, she was invited for lunch, and so he wore one of them in the hope of pleasing her.
The meal was a tense and uncomfortable one, with the mother-in-law maintaining a stony silence.
Finally she spoke. "Alright, what's wrong with the other tie?"

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Traffic signal

In 1909, Thomas M. Flaherty filed for a U.S. patent, with an idea for a "Signal for Crossings" This was the first U.S. application for a traffic signal design, later issued as No. 991,964 on 9 May 1911. His signal used a large horizontal arrow pivoted on a post, which turned to indicate the right of way direction. It could be activated by an electric solenoid by a policeman beside the road. Although filed first, it was not the first patent actually issued for a traffic signal. Ernest E. Sirrine filed a different design seven months after Flaherty, but his patent was issued earlier, and thus he held the first U.S. patent for a "Street Traffic System" (No. 976,939 on 29 Nov 1910).

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