You can see that the sofa below is a "flexible sectional" by looking at the frame underneath the chaise cushion. You'll see it's actually two parts instead of one continuous piece. The "ottoman" (for lack of a better word) can be unclipped and attached with recessed hidden hooks to either end of the sofa, so that all you have to do to make a change is flip the chaise cushion over and swap it with the opposite end cushion.
The only clue that belies the flexible nature of the sofa is the division in the frame where the ottoman meets the sofa, and the extra set of legs where the two parts meet.
Sorry for the messy photos, but you know, that's how we roll at the factory. Believe me, you want a to see a factory floor littered with piles of foam and staples and all the tools of the trade...meaning a lot of creating is going on there and due to the sheer volume, the craftsmen probably know what they're doing. Or like the saying goes: "Never trust a skinny chef."
Thanks for stopping by....have a great day!