 Wong was highly active during the Umbrella Revolution : he held a contest for the best logo to elevate awareness and generate more concern for the demand for " real universal suffrage " for Hong Kong . Using social media as a " safe platform " for universal participation , he generated considerable awareness and received entries from all over the world . Wong held sessions where he would draw a person 's portrait in one minute without looking at the paper – the concept inspired by Nelson Mandela 's maxim " It always seems impossible until it 's done " . He also co @-@ founded Umbrella Movement Art Preservation , to make an inventory of works and their locations at protest sites , aiming to rescue key pieces before police clearances . 
