Douglas Harding has another nice little experiment: the indestructable crash-helmet.
Take a letter size piece of paper and cut or tear a large oval hole in it.
Hold it up, and note how the hole is empty and yet filled with whatever it is held up to.
Also note how the space is indestructable. You can explode a nuclear bomb in it, and the space would still be unharmed.
See how, for now, it is all out there: the emptiness and the forms.
Then, gradually bring it to where you are looking from. Notice how you now become this emptiness and fullness. This indestructible emptiness filled with the world. Were you ever anything else?