Birthday song comes with birthday cake. When the protesters of Umbrella movement faced some unreasonable complaints and insults by some people, they would sing birthday song in return, resolving the grievances to blessing. Instead of celebratory phrases, on the work "Birthday Cakes" are the statements that caused controversy, for examples, "The Sino-British Joint Declaration is void." "Hong Kong is China's direct -controlled municipality." Is this a blessing or a curse? Delicious or hard to eat? Real cakes were served as a form of performance in the exhibition. To eat can mean digest and agree with something or disagree with something and eat it with anger. It is up to the audience on how to eat the cakes.