What you see in the first photo is actually a housing garage for a large roll-out prayer rug. When prayer times come around, the unit is opened, and the prayer rug is rolled out. It can accommodate quite a few worshippers for prayer. When the prayers are over, the carpet is simply rolled back up into the storage unit.
The red prayer rugs shown in the second photo are also used for public prayer times. These are just left on the sidewalk for worshippers. Sometimes they are rolled up or folded so they don't get so dusty.
