ALL ASWIRL by Violet
Because of the soft pastel colors Violet chose, and the often thin border lines between the "tiles", the basic "tile" shape (the shape that repeats to fill the page) is a little hard to see. It's a three-petaled flower. If you look just to teh right of the center of the page, you can see where six flowers meet. They form a hexagon, or a collection of 6 equilateral triangles. It's hard to say which shape Violet started with, but I'm going to guess she started with an equilateral triangle and added and subtracted from its edges to make the basic "tile" shape of her tessellation.
Like all good tessellations, All Aswirl shows no gaps or overlaps. All the elements fit together snugly, like a well made jigsaw puzzle.
Just for fun, compare Violet's All Aswirl to a similar tessellation that also uses groups of 6 three-bladed propellor shapes, Pinwheels by Vicky. Notice how Vicky's strongly contrasting colors may be a bit overpowerful when viewed up close, but when the art's viewed from a distance Vicky's color choices make a lot of sense: they easily show where one "tile" ends and the next begins. These are tough color choices every artist has to make.