Coins, newspaper clippings, photographs - seal them in a container and you have instant archaeology.
As Hong Kong entered its new era as a Special Administrative Region of China, students at Quarry Bay School lovingly sealed their personal 'relics' inside a time capsule and buried them in the school grounds.
Sealing the capsule was one of the highlights of a special day of handover celebrations at the school.
Principal David Harrison said: 'The handover is a great event for our students, even though they are studying at an international school and come from throughout the world.' He said he felt non-Chinese students living in Hong Kong could still appreciate and understand the significance of the historic event.
Students selected to bury the capsule were Ji Sun-choi, Kirsten Foster, Joseph Breen and Alex Higgins.
It will be opened 30 years from now, enabling students in 2027 to learn about how their predecessors had lived and learned.