Shell Walk Surface Steps 01-0:02 Shell Walk Surface Steps 02-0:02 Shell Walk Surface Steps 03-0:02 Shell Walk Surface Steps 04-0:02 Shell Walk Surface Steps 05-0:02 Shell Walk Surface Steps 06-0:02 Shell Walk Surface Steps 07-0:02 Shell Walk Surface Steps 08-0:02 Shell Walk Surface Steps 09-0:02 Shell Walk Surface Steps 10-0:02 Recording of footsteps on seashells.