FURNITURE: Surround scenes of day and night skies. TRIGGERS: day , night. The node is the center of the circle on the floor. You will know when the whole scene lights up. You may want to use your furniture tool to slide it to fit, scale (make it smaller/ Shift and the square within a square , the 4th tool from left) ) or pulled down under the building (Shift key and the cross, the 2nd tool from left ) Hope that helps! Derivable version is available for those who prefer their own backdrops.