Are we identical with our bodies or are we beings which have bodies? Philosopher Alvin Plantinga makes an argument, borrowing from Franz Kafka's novel Metamorphosis, for the latter view: If we just are our bodies then it would be incoherent to think that we could exist apart from our bodies, that is, there would be a contradiction involved in trying to imagine such a state of affairs. It would be like trying to imagine a triangle that doesn't have three sides.
Here's a thought experiment: Imagine yourself having an out-of-the-body experience where you're looking down from above on an operating table upon which your body is lying. Whether or not you believe OBEs happen, such a scenario doesn't seem to be incoherent, like trying to imagine a table with no surface, but if it is coherent to imagine our selves being separated from our bodies then our selves can't be identical to our bodies.