I'm experimenting with entrelac squares that are half-and-half knit and purl. This fabric would look the same on both sides, except it would be mirror-reversed. The pink arrows show the direction of knitting the squares. Black is reverse-stockinette, white is stockinette fabric.
When a stockinette fabric meets a reverse-stockinette fabric across the boundary of an entrelac square, the fabric is continuous, that is, there is no ridge. This gives some interesting effects in the fabric, making it hard for me to predict how a fabric will look once knitted out.