Each step corresponds to an ice age, a long period of reduction in the temperature of the Earth's surface and atmosphere, from 750’000 BC (step 1) to today (step 15). When the visitors walk up the stairs, their feet trigger a different sound on each step. We also included a notion of randomness in the sounds which are played to offer the visitors a new experience each time they walk up the installation.

For the audio part, we worked with professional actors Simon La Barrière and Charlotte Riondel and music composer Bryan Bendahan to record different voices around the glossary of "warm" and "cold" to distinguish each ice age.