In 1622, Queen Njinga of Ndongo arrived to negotiate with the Portuguese governor of Luanda, who offered her a floor cushion instead of a chair — signalling subordinate status before the talks even began. Njinga had her attendant kneel on hands and knees; she sat on his back as her throne. The negotiation proceeded with the framing reset in front of every witness in the room.
The principle: The terms of a negotiation are usually set before the first word is spoken. The room's furniture, the order of speakers, who introduces whom — these are pre-negotiations and they predict the outcome. If the framing being offered diminishes you, refuse it before you talk substance. Reset the terms while you're still in the room, in a way the witnesses can see.