Balcony pillar and sofa size

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In this sky suite mockup video I'm seeing a pillar right in the middle of balcony... which isn't marked on deck plans or shown on any room renderings. If this pillar doesn't mean anything I don't think Celebrity would let it displayed in a mock up right? Does anyone know how to spot a room with this pillar on Edge?

Also what's the size difference for single sofa vs double sofa as marked on deck plans? I've never noticed any single sofa on other ships, they all looked similar to me that could mostly sit two people.

I don’t believe the ship will have pillars on the verandahs. The pillar appears to be part of the skeletal structure of the mock up. Apparently there was no way to conceal it.

I haven’t seen any deck plans that show single or double sofas.

Deck plans on the Celebrity website have notations for convertible sofas which I would assume are all the same double size providing seating or a bed for 2 people.