There's a magical math operation called DCT (discreet cosine transformation) which can turns things into dust (frequency domain) and back (spatial domain). So y

There's a magical math operation called DCT (discreet cosine transformation) which can turns things into dust (frequency domain) and back (spatial domain). So you DCT a woman and you get woman-dust. If you DCT the woman-dust you get the woman back. So what you do is DCT a cat to get cat-dust and sprinkle it on the woman. It's hard to see the cat-dust but if you look really closely you can see it (upper left corner of the image). We now have a dusty woman. Then you DCT the dusty woman and get a dusty cat! Look in the upper left and you can see the woman-dust. Apply the DCT again to this image and we're back to the dusty woman. Just apply DCT all day long to swap between a dusty cat and a dusty woman! You must be wondering why does this work? It's due to the properties of dust and human perception. When we DCT the woman and cat you'll notice most of the dust is in the upper left corner. That's where all the heavy dust is. It's fine to lose the lighter dust further out or even add more dust out there since most of the weight is in the upper left, the DCT will get you close enough.