Lines also have their meaning
The tattooist working with the client's drawing by depicting it on the skin, will depict horizontal, oblique, vertical, parallel or lines of different directions. Lines give the work and composition a serious or cheerful, serene or tense feeling. George Seras wrote, Hostile lines - are those that form a right angle, Joy - will be achieved with upward lines, Peace - with horizontal lines, while Sadness - with downward lines.
Today, little is known about the indigenous art of tattooing, but the few informative sources available today, indicates that they respected the direction of the lines on the skin, thus creating the desired effect that reached the viewer who looked at the marked body.