Thannal is a Natural building awareness group founded in 2011 by Natural Building architect Biju Bhaskar and Sindhu Bhaskar. With 12 + year of service in natural building, the founders have developed an online tutorial video series, called "Back Home," to make learning about mud construction easy and accessible for anyone. The Thannal app, which is currently available in Tamil and English, gives exclusive access to the Back Home tutorial videos and research and documentation from Thannal.