To work this graph you start with a basic crochet circle start.

Either: chain four, slip stitch in 4th chain from hook, chain one OR use a magic ring.

Then continue to work in either rounds than connect with slip stitches or in a spiral.

The red dots indicate increases, 2 stitches in this stitch (except the outer round, that was just a stoping point).

SPIRAL: I have a Spiral Tutorial ready to download in PDF format.

NOTE: hex paper is wonderful for tapestry crochet!