In which we are not discussing mathematics

Having fun with the acrylics again.

This is what I did:

Gesso page

Paint black patches just large enough

to accommodate the butterfly and woman cutouts.

Apply cutouts with the tiniest bit of glue stick.

Gesso any remaining black around the cutouts.

Proceed with background and embellishments.

When dry, carefully lift off cutouts.

Viola!  Cool silhouettes!

Then you are left with these nifty painted shapes.

I popped them onto some black paper

for the inverse of the picture above.

Isn't that fun?

Here they are side by side:

Easy peasy,

 and not a single math function to achieve the inverse!