Horizontal or Vertical. Any Signifigance?

Hi everyone, its been a while since I have been on here so I may have missed anything that discussed this topic.
I recently was sent an email with two patterns and instructions to look at first one then the other then back at the first and see if my brain saw first the Horisontal or the vertical lines. Does anyone have any informarmation on if this might be in any way useful or if it is merely a curiosity?

Horizontal or Vertical. Any Signifigance?

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