We present the design of an experiment investigating presence disparity in mixed presence collaboration using digital tabletops. In an attempt to verify previous work and relate their results, we examined different presence representations of remote collaborators: audio, video, telepointers and video arms. Our early results show some interesting trends that we are currently investigating in more detail through further analysis of our data. Keywords Tabletop, mixed presence, collaboration, presence disparity ACM Classification Keywords H.5.3 [Group and Organisation Interfaces]: Computer supported cooperative work