I'm really digging the engaged faces, educational self-play... and quiet!
It's a dream of mine to create a peaceful, organized, minimal, all-natural play-room like this for my guy and his friends. This very short video via the MMP School in Mount Pleasant, SC has also peaked my interest in Magda Gerber's method of child education, RIE or Resources for Infant Educarers.
This book looks like a good place to start...