Escher Rock and the "paved walls" of Endurance - Sol 208 (false colors)

Caprtion NASA originale:"This false-color image taken by NASA's MER Opportunity shows a rock dubbed Escher on the southwestern slopes of Endurance Crater. Scientists believe the rock's fractures, which divide the surface into polygons, may have been formed by one of several processes. They may have been caused by the impact that created Endurance Crater, or they might have arisen when water leftover from the rock's formation dried up. A third possibility is that much later, after the rock was formed and after the crater was created, the rock became wet once again, then dried up and developed cracks.
This image was taken on Sol 208 (Aug. 24, 2004) by the Rover's PanCam, using the 750-, 530- and 430-nnmt filters".