Explanation & Background
Repeating shape is the regular hexagon.
Inside the hexagon there is a rotation over 60, 120, 180, 240 and 300 degrees, the whole horizontally mirrored.
System P6M is very suitable to design symmetric patterns.
More Tessellations of the type P6M:
Islamic Art, Ottomane Tessellation I
Just one line !
Just one line II
Archimedes' 3 rd pattern
Ottomane Tessellation I