Forcing yourself to use restricted means is the sort of restraint that liberates invention. It obliges you to make a kind of progress that you can't even imagine in advance.
Pablo PicassoI always forbade everyone to clean my studios, dust them, not only for fear they would disturb my things, but especially because I always counted on the protection of dust. It's my ally. I always let it settle where it likes. It's like a layer of protection.
Pablo Picasso