Data were produced between March and May 2017. Initially, an invitation email was sent to participants explaining the purpose of the study and providing information about the requirements: a copy of the floor plan, if available, and a series of participant-produced photographs of the windows and the room interiors that were to be taken before the home visit. Participants who accepted the invitation to participate received detailed instructions by email and had 20 days to complete the assignment (see Figure S3 in the supplemental data online). They were given a total limit of 25 images and file size (approximately 1 MB), but distance range and time of day for the photography were unrestricted. Participants were also asked to assign one to three keywords to each image of the windows in the hope of encouraging them to further reflect on the topic. The instruction was: