The curve on this cushion cover is known as a ‘Hilbert Open Peano Curve’. Theoretically, curves of this type can be made to completely cover a surface.
This doesn’t work in real life. The cover consists of a very open filet crochet grid with the curve applied in surface crochet. The cushion shows through the grid.
We also have an afghan version of Spacecraft.
Buy the cushion pattern using the link at the top of this page
or in Cushy Numbers (a PDF book of 12 cushion patterns)