A time capsule has been buried containing objects which children believe will help future generations understand the way we live now.
The children also included ideas for future inventions
A class from Rose Hill Primary School, in Oxford, chose the items and included clues for archaeologists in the future to help them work out what they are.
Author Colin Dexter joined the class to bury the capsule under the foundations of the new Pitt Rivers Museum.
What the children chose to include will remain a mystery until it is opened.
They also included drawings of new inventions they imagine could be used in the future.
Andy McLellan, head of education at the Pitt Rivers, said: "We have no idea when these objects will be seen again and what those who find them will know about Oxford, or even our planet. These objects will provide some clues."
The schoolchildren were learning the skills required to be an archaeologist or curator during their "Making a Museum" project in the Pitt Rivers and the University Museum of Natural History.
The new extension to the Pitt Rivers is due to be completed in 2006.