The ladies’ room at the Signature Room at the 95th was the Reader‘s pick for best restaurant bathroom in its Best of Chicago issue. Little did we know that restroom appraisal had become such a hot topic. This week WTTW’s Chicago Tonight followed our lead, enlisting Reader restaurant critic and food columnist Mike Sula as its guide for a whirlwind tour of Chicago’s best restaurant bathrooms. You won’t see his face (a restaurant critic has to be able to dine anonymously), but you will see historic urinals, a bathroom fish tank, and a restroom/sensory deprivation tank. (You’ll also learn about