Composite core with non-traditional geometries

A composite core comprising:

• a plurality of individual elongate tubes arranged in a two-dimensional array, each tube made of a composite material, each tube comprising a plurality of curved sides, each curved side inwardly curving toward a longitudinal axis passing through a geometric center of the tube to form a valley on an outer surface of the tube, wherein an end of a first curved side connects to an end of a second curved side to form a crest on the outer surface of the tube,
• wherein at least one crest formed on an outer surface of a first tube in the two-dimensional array contacts at least one valley formed on an outer surface of an adjacent second tube in the two-dimensional array, and
• wherein a first crest formed on the outer surface of the first tube contacts a first valley formed on the outer surface of the second tube, and a first valley formed on the outer surface of the first tube contacts a first crest formed on the outer surface of the second tube.