One day last November as the early winter sun set, Anne-Marie Tomchak received a call from a woman called Marie Sullivan. Sullivan had called to talk to Tomchak about Sullivan’s daughter, Arwen. With the low sun streaming in the window of her London loft, Tomchak, Sullivan and Sullivan’s old friend Maeve McMahon talked about Arwen. They spoke about the kind of light that Arwen brought to the world and the conversation inspired Tomchak to create something that would pay tribute to Arwen’s life. Arwen Sullivan had died, aged 23, the previous April. Tomchak launched her new enterprise ShareJoy, a sustainable…