One Hydroponic Plant Tower can Feed a Family !!

Just took this picture ..on just this one tower I have growing 4 types of Lettuce  ..two different types of Tomatoes..Vietnamese Herbs..Purple Cauliflower..Cucumbers..mint and Spearmint .. Black Basile ,Swiss Chard and Greek Oregano..They are all growing happily close together with the same hydroponic nutrition soaking their roots...and the tower,including the water tank below is only 2 and 1/2 feet diameter..and has wheels  to move it around easily .