In Yoshi’s Island, all outdoor levels have a color gradient set as the last background layer. However, in some levels, it is covered up entirely by other layers. Here is a comparison of Level 2-5 as it normally appears, and the hidden gradient visible by disabling the far mountain layer.
This computer-generated images depicts part of Mars at the boundary between darkness and daylight, with an area including Gale Crater, beginning to catch morning light.
Gale Crater is 96 miles (154 kilometers) in diameter and holds a layered mountain rising about 3 miles (5 kilometers) above the crater floor. The intended landing site is at 4.5 degrees south latitude, 137.4 degrees east longitude.