Who thought to put the toilet there?

Have you ever wonder who brilliant idea was it to put the toilet in the same place we brush our teeth? This may be the reason some walk around when brushing their teeth. Some toilets are separate from the sink, but normally the toilet is to the right or left of the sink. I get the idea of washing your hands, especially in public places, but even the sink is separate from the toilet. I just ponder who brilliant idea was this bc its not so brilliant. Instead its pretty tummy twirling.