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No. Non-existent patterns do not qualify as tessellations.
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It is a regular tessellation.
A regular tessellation.
It is a regular tessellation.
Examine at some of the Symmetry artwork of MC Escher. He inspired Sir Roger Penrose, a mathematician whose work will shed some light on the mathematical uses of tessellation.
If it also covers a surface without overlap, then it is a regular tessellation.
One type of symmetry is rotation. The second type of symmetry is translation. The third type of symmetry is reflection.
a tessellation that uses more than one type of regular polygon
Bilateral Symmetry
Bilateral symmetry