"if you want to keep the feeling of sunlight , just add a very pale gray shadow to the bottom of each cloud , and around the edges like this ... '' he dabbed at the wall with the gray paint and jamie watched , fascinated as the clouds suddenly appeared as if they were really floating in front of him . '' here , you try now , '' said mr. roberts , holding out the _ ..." What is the word in the blank space (_)? The answer is
brush