Fellow Twitterer K. Alexander (亞天恩, @thian_un) just mentioned how nice it would be to have a hermitage where one could retreat for a bit of sustained thinking and writing. In response I suggested this charming structure, the Oval Pavilion at Farnborough Hall, Warwickshire, as a model for the ideal retreat.
In good weather you could sit on the open lower level, admiring the landscape and perhaps doing a bit of sketching. The contemplation and writing could take place in the cosy and yet light-filled room upstairs.
The only problem might be that the exuberant rococo decoration would be rather distracting and might lead to frivolous thoughts.