[he's in his bipedal form for ease here, as being crouched over in his beast mode would make it slightly more difficult to interact.]

Good afternoon, [he says in greeting, going to take the crystal out before he sees bob, where he immediately crouches down. his optics arc in the way they do when it's obvious he'd be smiling, if he had a mouth.] hello, Bob. Are you enjoying the structure Sunstreaker got for you?

[can't be rude, though, and it's when he stands up he sees the mural. primal's optics widen, the delicate spines around them spinning rapidly as they contract and take in the mural.]

Oh.

[he doesn't know how to react for a moment, then looks back over to sunstreaker.]

Ah... sorry. Your work is beautiful. Is that Earth?

[primal is somewhat sure he recognises the trees as the ones you find on earth, but it's a big galaxy. could be any planet. worth asking though.]