Black Haired Girl On The Chair With A Navel Tattoo

The umbilicus is also used to visually separate the abdomen into quadrants. The navel comes in the center of the circle enclosing the spread-eagle figure in Leonardo da Vinci's Vitruvian Man, his famous drawing on human proportions. This illustrates the principle that in the shift between the spread-eagle pose and the straight pose, the apparent center of the figure seems to move, but in reality, the navel of the figure remains motionless.
Some people have a smooth indentation instead of an "innie" or "outie", usually due to surgery for umbilical hernia, gastroschisis, or tummy tuck. Overweight individuals have larger belly buttons on average than those of normal weight.