 Existence Monism, chiefly sponsored in recent times by Horgan and Potrč, says that there is exactly one  object.[15]  (Or at least, exactly one concrete object, or one concrete physical object.) The one thing (which Horgan and Potrč call ‘the blobject’) is huge, and very complex, though it does not have any parts. It has different properties at different regions (2000: 249 and 2008: 8).