There is one modification I make to them, to align them with Montessori principles: if they come with a set of design cards, I utilize any of the cards that show how the pieces form other pieces (this is akin to the constructive triangles material); and I remove all the cards that show designs.
|The three cards on the right - we like those type for some self-guidance.|
The two cards on the right - I prefer the children to discover those patterns for themselves.
Why? Because the children should use the pieces to create their own designs and discover for themselves the variety of "pictures" they can form. I find too many times over that providing the design cards, locks a child's mind into design mode and less on creative pattern discovery.
Toys in a Montessori Home - Lower Elementary
Tessellation Patterns in our Co-Op
Informative and interesting site about Tessellations: Tessellations.org
Some 3-dimensional "tessellations" - the power of 2 in elementary and the power of 3 in adolescent mathematics.
Fractals extensions totally work off of here too!