Who goes there?.

 Meet Mavis and Daisy, two guardian stone robots carved in Bath limestone, now in a private collection.

 Friend or foe?.

They are keeping an eye on Snoozer, also carved in Bath limestone
and in the same private collection.

RR-Rocket ship
They are all travelling through space inside this rocket ship
carved from Portland limestone
also in the same collection

 Deep deep space
They need to watch out for the black hole.
Portland limestone
Same collection