Multi-block printing means you can have different colours in your prints. It also means separate plates for each colour.
Here you can see an example by my heroine, Lilli Tschudi.
Picturing which part of the image you have to carve and how the two (or more) colours will combine, and making sure they register in the right place, is complex. Fun, but complex.
These are the two plates, carved on Japanese vinyl. - I had to finish the second at home.
This is an image pinched from a painting by German expressionist artist Kirchner. (I don't like copying other artists much, though it is educational, but sometimes during workshops and work you don't have time to think ideas up.) A girl on a sofa with stripey dress & stripey socks, a little cat curled up next to her, I felt an affinity. Plus the stripes would translate well onto a print.
I I only got one plate finished in time and decided to print it up by itself in one colour, just to see. Which do you prefer?