Projectors are arranged on, in, or about {HEAD ~ the structure} to project {TAIL ~ light} toward the object 
to project
Projectors are arranged on , in , or about { HEAD ~ the structure } to project { TAIL ~ light } toward the object
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH