It is the seventh year that Google is organizing the Doodle 4 Google competition. This year's winner is Audrey Zhang for her doodle titled "Back to Mother Nature", whose doodle was picked from more than 100,000 entries. If you happened to visit the Google page on monday, you would have had a chance to see Zhang's doodle on Google's landing page.
The theme for this year's competition was "an invention that would make the world a better place." Zhang's doodle depicts a 'transformative water purifier', a submarine-like contraption that sits in a swamp with fantastical creatures such as dragons, blue mushroom and even a whale wearing a top hat. The machine pumps in dirty water and turns it into clean water, turning the swamp into a happier healthier place. Audrey's inspiration for the design came when she learnt that 'not everyone has clean water'.