Since Christ­mas Val Mur­ray and Lynn Pilling (Tea) have been using a space on the sec­ond floor of Fed­er­a­tion House on Bal­loon Street in Man­ches­ter as a play­ful, evolv­ing instal­la­tion. Cur­rently the build­ing is being used as artists’ stu­dios and exhi­bi­tion spaces in a period of tran­si­tion between its past uses as a Coop drapery…