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On Tatooine outside Luke's house, there are these small tower-like objects outside Luke's home. There are 3-4 of them.

enter image description here

The same thing can also be seen outside of Obi-Wan's house as well.

enter image description here

What are these and their purpose?

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Those are moisture vaporators. These are quite literally the entire point of the moisture farm, to collect atmospheric water vapor. According to the Star Wars: Official Fact Files, a single vaporator can collect 1.5 litres of water per day.

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enter image description here The Official Star Wars Fact File #8

enter image description here The Official Star Wars Fact File #8

The one outside Ben's house (an abandoned moisture farmer's hut) is a low output vaporator, one suitable for a single house.

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Star Wars: Inside the Worlds

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    Very similar to binary loadlifters in most respects. – Tim Pederick Sep 10 '17 at 11:09
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    @Tim my first job was programming binary load lifters! – Robert Columbia Sep 10 '17 at 12:57
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    1.5 liters a day for a whole house? That's not even enough for a single person. – DonyorM Sep 10 '17 at 15:13
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    @KevinMilner - Is your basement on a desert planet with two suns? – Valorum Sep 10 '17 at 17:09
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    @user151841 the post says that the picture shows a "low output vaporator, one suitable for a single house." Implying that one is suitable for an entire house, which isn't very likely. (Unless I misread a post). – DonyorM Sep 11 '17 at 2:25

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