 Existence monism targets concrete objects and counts by individual token. It holds that exactly one concrete object token exists (the One). It represents an interesting and historically important form of monism, albeit one which is widely regarded as deeply implausible. Consider any two concrete individuals, such as you and I. The existence monist must either deny that at least one of us exists, or deny that at least one of us is a concrete object, or hold that we are identical. This is hard to swallow. (It is important to distinguish existence monism from priority monism, which does not have this implausible implication.)