This design enable you to wash your hands with clean, potable water and use the grey water dirty water from hand washing to flush the toilet. This will save thousands of gallons of water a year and greatly reduce one's water bill by using the water twice.
Some people love the picture they have in their head of you. They're not willing to accept you for who you really are, and never will. They'll slowly suffocate you, it's not that they want to they're just not right for you.