Image From Mars' Spirit Mission - 'The Cube'

http://marsrovers.jpl.nasa.gov/gallery/all/2/p/676/2P186379087EFFAJQVP2265R2M1.HTML

Panoramic Camera Non-linearized Full frame EDR acquired on Sol 676 of Spirit's mission to Gusev Crater at approximately 12:26:29 Mars local solar time, camera commanded to use Filter 2 (754 nm).

[Source: marsrovers.jpl.nasa.gov]