This interview is based on a conversation with Katie Vale, 46, a milliner from Essex, UK. It has been edited for length and clarity. My parents had an 18-square-foot shed built in their back garden in the mid-90s, which served a variety of purposes. My mother is very creative, and she wanted a space to sit and paint. So it was an artist's studio for a few years. Then we put in an air mattress, and it became somewhere people could sleep if the house was full. My nephews treated it like it was