Over your head..

Been in a very large industrial building for a couple of days this week..

If you're in such a building, office block etc. with a "suspended ceiling" above you, just look at all the "stuff" that's up there unseen.... !

Air-conditioning trunking, electric cables, fire sprinkler systems etc. the whole lot held up there by a sea of slim steel strands - like spider threads - from the roof above..

Mind your head....