This is somewhat related to this question.

I'm about to sign a contract with a company that this sort of "all your base are belong to us" clause in it: it says that all programs, designs, sketches, drawings I create in relation to my job belong to the company. More or less usual stuff (unfortunately).

What worries me, however, is this "drawings, sketches" thing, because I'm a hobby-artist and I paint and draw at my spare time.

Can the company somehow claim ownership of intellectual rights on this work? Should I ask them to explicitly state that this clause does not extend to work of art or is this "in relation to the job" part is good enough?