I sent my portfolio as part of a job application for a small software company. Everything seems to be going well and we've arranged to meet.
They've asked for additional sample work in the languages they use that my portfolio doesn't have too many examples of.
However, they've also asked for some art-based work, which is listed on my CV, but the job doesn't include any artistic- or media-based requirements.
What reasons could they have for asking for that kind of work? How should I ask them why they want that kind of work without coming across in the wrong way?