Go ahead and flop on your back and stretch your supple spine out to its fullest extent from front paws to tail tip during an important conversation. If your interlocutor is a cat, he’ll understand.
If he’s not a cat, why were you talking to him in the first place?
When taking a selfie, be sure to position your pretty face just so and, if at all possible, surround yourself with jewelry, curtains, and/or woven window seat mats that enhance your uncanny eyes.