The roof structures of the Opera House are called ‘shells’. This was the most difficult part of the building’s desi… https://twitter.com/i/web/status/1107625535906160640

by | Mar 18, 2019 | Tweets | 0 comments

The roof structures of the Opera House are called ‘shells’. This was the most difficult part of the building’s desi…

https://twitter.com/i/web/status/1107625535906160640

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