"A deckchair is a folding* chair, usually with a frame of treated wood* or artificial material* (for protection against the weather*). It is meant for leisure*, originally on a big cruise ship's* deck, which explains the origin of its name.
It is easily transportable* and stackable*. The classic deckchair can only be locked in one position*." -wikipedia
Wonder why these never caught on in churches, instead of pews?
* emphasis added