  We give a definition of uncomplexity of a mixed state without invoking any
particular definitions of mixed state complexity, and argue that it gives the
amount of computational power Bob has when he only has access to part of a
system. We find geometric meanings of our definition in various black hole
examples, and make a connection with subregion duality. We show that Bob's
uncomplexity is the portion of his accessible interior spacetime inside his
entanglement wedge. This solves a puzzle we encountered about the uncomplexity
of thermofield double state. In this process, we identify different kinds of
operations Bob can do as being responsible for the growth of different parts of
spacetime.
