ARENA Dance’s One Room unites six women in a seamless glide of movement. A river runs through its ebb and flow, highlighting the strength and agility of the dancers, showcasing their individuality even as they speak in one communal voice. Choreographer Mathew Janczewski captures the suppleness and clarity of dance gesture as a language in itself, independent of any melodramatic overlay. Pure as a mountain stream carrying essential minerals, One Room brings to mind Trisha Brown’s unassuming complexity. The performance is set to original music by Nils Frahm.