Shade sails at shopping centre carparks

In private correspondence I mentioned in passing the shade sails at our local shopping centres. I was asked what a "shade sail" is, so here are some photos. I believe the material is similar to that used in the sails of boats (hence the name). You can see that the designs differ quite a bit. They have some use as shelter from rain as well as sun, though the rain often blows under them. The photo below was taken at the new Centro shopping centre, which opened last year. The second photo was taken at the older Whitsunday shopping centre, which is being upgraded; the shade was added in the last few months.