View in Roassal can now be rotated. 

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v := RTView new.
b := RTMondrian new.
b view: v.
b nodes: (1 to: 20).
b edges connectFrom: [ :value | value // 2 ].
b layout tree.
b build.

v @ (RTRotableView new center: [v elements first position ]).

v

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Cheers,

Alexandre