Sprinkler systems are compact and elegant, in most buildings you would be unaware that sprinklers were fitted unless looking for them specifically.
You can now get a miniature sprinkler which are a little bigger than a 50p pence, they are neat and robust and are fitted with ceiling rosettes, which in most cases can be painted to match any colour scheme.
Concealed sprinklers are recessed and covered by a flat cover plate which is flush to the ceiling. These are unobstrusive and almost invisible. These are ideal for clean areas, where there is restricted headroom or where vandalism problems are high.