It has been a while since we read Dream of Perpetual Motion, so I will try my best. If you have any questions to add please do.
It seems to me, as though the book Dream of Pnperpetual Motion is an upside down view of the Tempest. At the end of the Tempest, Miranda is marrying Ferdinand and Prospero is, in a sense, getting off of the island, but for Prospero in Dream of Perpetual Motion it is the idea of the island he is wanting to create. Does this seem apparent to you?
Obviously both of the Prospero’s are temperamental and unsatisfied, but what would the appeal of seclusion be?