You may not see white on white. You'll see black on white.
I'll show you some tricks with this natural rule.
Draw white things on a white background?
(A second Malevich!?)
I made an animation with this 'You can see or not see by the background color'.
You might think I drew different curves on left-half and right-half. I just drew curves in black and white on the whole canvas.
You can see it with a colored background.
And this is the developed product with this rule in Processing.
Blending the blendMode().
The blendMode() can make a similar trick.
If I drew with blendMode(ADD).
The blendMode(ADD) sums colors, so blue lines plus white background equals white.
You can see an interesting result when you change the blendMode() alternately.
You can draw such decoration with simple rectangle with changing blendModes.
This animation work in Processing was made with two blendModes.
It may be a cheap trick. But everything will work if you let it, you can make some interesting things. Enjoy!