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I recently came across this build from Markus Rollbühler:

Bridgetown

It includes many great details and building techniques. I'm curious how the conical tower roof is formed, though:

Tower roof

It's obviously made using a number of cheese slopes:

cheese slope

How are they all attached?

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    Something cheesy is going on with that roof.
    – Alex
    Nov 30 '21 at 15:45
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At first, I assumed that this was a clever technique using something flexible like a net or tubing. After a bit of digging, I found a similar tower roof on a different build by the same person:

Similar build

Someone had asked about the roof technique on that build, and Markus included a photo looking up the inside of the roof structure:

Tower interior

The build makes use of round elements of different sizes with elements of an appropriate length clipped around them like spokes. This is a great technique that delivers a nice result if you have loads of parts and patience available.

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    I'm not quite sure pictured technique has been actually used in build posted in question. Maybe a variation of it, but not exactly the one mentioned here. Picture clearly shows two cheese slopes are kept together with single robot arm while original build has each cheese slope placed individually.
    – Alex
    Nov 30 '21 at 15:43
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    @Alex That's a great point. I assume the the inside structure is similar, but the build from the question only uses one cheese slope per spoke.
    – jncraton
    Nov 30 '21 at 16:23
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    You can attach the cheese slopes to the light grey "light saber grips", leaving out the darker grey robot arms.
    – arne
    Dec 1 '21 at 8:21
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    This exact building technique, while possible, wouldn't be used by LEGO, since wheels could be stressing out parts and connection looks to be rather weak (wheel doesn't have bar connections). TLG, however have recently announced Sunflowers (40524) set, which is using similar approach, but with "legal" technique, as seen Brickset review.
    – Alex
    Dec 5 '21 at 17:59

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