A few qualities :

* Unique - odds are the neighbours won't have it
* Impermeable to the elements - and fully washable
* Indestructible
* Versatile
* Demountable
* Comfortable
* Therapeutic - arrange backrest to hit all muscle trigger points
* Easy to add to the suite as circumstances dictate


                                                                                           Here's an armchair - super comfortable , cheap to build -  ticks all the ferrolithic aesthetic boxes


I have in mind to build a sunlounge...