Two workers lie down to place small plywood form on outside of exterior column to place concrete in gap between edge portions of precast hollow core floor slabs. Far worker is drilling through form into concrete to attach form to the concrete. The metal clasp at top is tied back to ensure the form does not fall if workers release it by mistake. A similar form is in place on the building corner to left of photo. Ashley Terrace, Ann Arbor, Michigan April, 2007.