Susan Jacobs and Nicholas Mangan respond to Simon Starling: In Speculum, discussing their own research-based practices with a focus on their shared concerns and engagement with materiality, scientific enquiry, site-specificity, the studio/workshop, research, scale, technology, and sculptural process. Susan Jacobs’s art encompasses drawing, sculpture, video and sitespecific installations. Whatever the media, she has a consistent focus on the properties of materials and spaces, directed by the processes involved in drawing. Jacobs works with a diverse array of materials, referencing the invisible and often indecipherable ‘stuff’ of the world that surrounds…