Alan Kay explained why he liked beanbag chairs at PARC,
And one of the reasons we used them was that we discovered it was almost impossible to leap to your feat to denounce someone once you had sat in a bean bag chair, because you tended to sink into it further and further. So it had a way of relaxing people and it was very good for design.
From Doing With Images Makes Symbols
What seating arrangement do you think works best for creativity, both individual and group? Personally I like pacing when I’m thinking alone.