Near many of the statues of The Buddha at Angkor Wat, one finds burning incense and an offering box. There is also an ample supply of incense about so devotees and others can light an offering to Buddha. The incense stands for ethics and morality.
According to the note on the offering box, the funds go toward continued support of the temple. I loved the temple so made a cash offering and lit a stick of incense to burn at the alter of the Buddha.