For modalists, the correct analysis of modality involves no quantification over possibilities or possible worlds. (On modalism, see Forbes (1992), Melia (2003: 81–98) and Peacocke (1999: 155–159).) Instead, modal notions are properly understood in terms of primitive modal operators like the box and diamond of modal logic. Since modalists do without quantification over possibilities or possible worlds, haecceitism and anti-haecceitism cannot be expressed in terms of differences between such entities. But, following Skow (2008), the modalist can nevertheless characterize anti-haecceitism as follows: