Since I have tagged few words with the topic - let me explain the same.
Colors : Yes - A flower market 150 years old located at the bank of Holy Ganges . One of the largest wholesale flower markets of Asia. Its more colorful in winters and a place open through out the year. I call it little Messy & Muddy but the Most colorful place in the City. A visit is a must!!!
Taste : Fruits , Vegetable & Fish market. ..The local daily markets. We are more into fresh veggies & fishes and the elders of family love to peep in these markets every morning to fetch fresh items. A place where sellers and buyers meet ,bargain and pick the best to satisfy their taste .
Art : Kumartuli : Blend of art , culture and history . If you are in the city , you should not miss this "Potters colony" where a mound of clay is transformed into amazing statues . Find artist working in their workshops - (Best time to visit September to March )
Knowledge : A street of 900 mtrs, hundreds of book stores, selling second hand books , famed as World's largest book selling market , dotted with renowned colleges and Universities. Its College street our Knowledge street ! How could you miss it ?