The Word of the Day comes from Tom Watson's debut novel "METRONOME"
TESSELLATE
verb
decorate or cover (a surface) with a pattern of repeated shapes, especially polygons, that fit together closely without gaps or overlapping. "the pavement is tessellated with slabs of white and rose-coloured marble"
(of shapes, especially polygons) fit together closely without gaps or overlapping. "hexagons are strong, symmetrical, and tessellate perfectly"