Shells

Whilst walking on the shore the other day I was looking for driftwood and shells for an idea I have on a tabletop about time and sand, all the shells still held their original creatures so were left well alone. Walking through a cash and carry that Mary uses for stock I noticed they actually sell shells in little tubes, less than 2 quid, that will do me, they had coloured sand, must go back for some, the plan has adapted with a strange twist.