I'm just playing dead. Well, in fact I'm not even doing that. In the beginning when I used to lay like this in the garden or the patio, my human thought I was injured, sick and sometimes even dead, but after a few times of seeing me like this she realized I just love to drop my fatass like that when I'm feeling comfortable and trust my environment.
There are many pics of myself like this, perhaps my human decides to upload them at some point.