Yea as Thor says some use a big thick seat post that telescopes down to fold the bike
Brompton does similar, But they also offer a 2 step telescopic, the upper section is a normal type seat post.
Bike Friday also uses a standard seatpost, its lower section is hinged to Fold, forward.
and some parts seem only color plus have?
not sure what our ESL writing , OP was wanting to say there..
Yoda ?