Use one common two-dimensional shape to create simple representations of things in the real world (e.g., line up several rectangle blocks to make a “road”).
Use more than one common two-dimensional shape to create representations of things in the real world (e.g., place small square blocks on the “road” to be the “cars”).
Use common two-dimensional shapes to create more complex representations of things in the real world (e.g., place triangles around a circle to make a “flower”).