Ridges......

Having been in school all morning this afternoon I have managed to find some time to sit on the sofa, pick up my crochet hook and try a variation on a square I have made before:

This square uses the pattern from Wednesday 27th March, but from the fourth round I have added in some sets of three basic trebles, starting at the corner and adding one more set each round, this has created a set of three ridges coming out from the centre on each side (the photo doesn't show this very clearly)