Three Fictional Futures

 

Dune has depth and is worth rereading despite a major criticism of its narrative structure and also despite a strong disinclination either to reread the entire series or to read any more of the endless add-ons although maybe it is possible to get drawn into all that as many others have been. 

Colourful fictional futures parallel each other in particular ways:

Dune

the Terran Empire period of Poul Anderson's Technic History

"A Style in Treason" by James Blish

Both Herbert and Blish describe ornithopters. Anderson's Terran Intelligence agent, Dominic Flandry, opposes green Merseians. Blish's Traitor-in-Chief of High Earth opposes an alien despot called the Green Exarch. All three works are exercises in imagination rather than speculation.