When encouraging the students to ask questions, one of them asked me why the clay smelt like bad cheese. I had to warn him that if i told him, he might regret having asked me, as it would seem like too much information!! He said he wanted to know, so I explained that a year ago, a fine art student had wanted to film herself rolling around in clay! Afterwards, she had put the clay into the recycling bin and ever since then it had all smelt like bad cheese!!