Perfect example of well organized building materials. Here you have a great combination of natural wood blocks and loose parts from the environment with just the right amount of variety and quantity so as not to overwhelm and still encourage sharing and collaboration without limiting creativity and innovation.
More about Waldorf and the use of natural materials and toys in this blog post "Waldorf Education in a Nutshell" at Moon Child blog. We're chatting about this at Montessori Moms on Pinterest Facebook group! Won't you join us? http://www.facebook.com/groups/561954717165412/