One example was the so-called "isolator": a shed with its windows nailed shut, where 17 toddlers were kept. In the darkness, they were using their sense of smell to know food from vomit or excrements.
A notorious example is the 'isolator', a small building with boarded-up windows where 17 young children were kept in darkness. They used their sense of smell to differentiate between edible food and indigestible waste.