# Regarding those Martian "Canals"

**URL:** <https://boards.straightdope.com/t/regarding-those-martian-canals/654532>\
**Category:** Factual Questions\
**Created:** [April 1, 2013, 3:00pm UTC](https://boards.straightdope.com/t/regarding-those-martian-canals/654532 "2013-04-01T15:00:28Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![naita](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/naita/32/5862_2.png) [@naita](https://boards.straightdope.com/u/naita)\
**Post date:** [April 2, 2013, 4:56pm UTC](https://boards.straightdope.com/t/regarding-those-martian-canals/654532/21 "2013-04-02T16:56:09Z")

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> [@ralph124c](#):
>
> So, what were the canals? Did they exist at all? Or simply the eye playing tricks on the brain? I still don’t see how the blue/green regions disappeared.

My WAG, they weren’t all that blue/green except in contrast with the red and in the minds of people seeing expanding and retreating vegetation.

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