Our thinking was the Breen as sort of a natural species were bifurcated in the sense that they can be both gelatinous and solid in that sense. But the solid state takes an intense amount of focus and concentration in order to maintain. [...] And then as they developed the refrigeration suits, they lost the need for that both evolutionarily and culturally, and it became a sort of cultural anathema. You don’t show people your solid face because that means you’re weak. It means you’re stupid. It means you’re slow.
I still don't get it. It doesn't really make sense to me. If it takes a lot of focus and concentration to maintain the solid form, why is one considered weak for doing so?
Breen ship! We’ve never seen the inside
Technically we've seen a holding cell inside a Breen ship in DS9.