It is a pattern in which the tessera - individual tiles - need to be placed so as to cover a plane without gaps or overlaps.
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Such a pattern is called a tessellation.
Tessellation
No. Non-existent patterns do not qualify as tessellations.
Tessellation is a pattern of overlapping tiles, like roof tiles.
A regular tessellation is a tessellation composed entirely of congruent polygons - meaning that ALL shapes in the tessellation are the same. Only 3 regular tessellations exist: equilateral triangles, regular hexagons, and squares. A tessellation is any pattern of shapes which can be repeated infinitely throughout a plane without leaving any "spaces" between the connected patterns and also without any of the shapes overlapping each other.