The Martian Obelisk became her passion, her reason for life after every other reason had been taken from her. Some called it a useless folly. She didn’t argue: what meaning could there be in a monument that would never be seen directly by human eyes? Some called it graffiti: Kilroy was here! Some called it a tombstone and that was the truth too.
Susannah just called it better-than-nothing.
The Mars room was a circular extension that Nathaniel had ordered built onto the back of the cottage when Susannah was still in the planning stages of the obelisk’s construction. When the door was closed, the room became a theater with a 360-degree floor-to-ceiling flex-screen. A high-backed couch at the center rotated, allowing easy viewing of the encircling images captured in high resolution from the construction site.
Visually, being in this room was like being at Destiny, and it did not matter at all that each red-tinted image was a still shot, because on the Red Planet, the dead planet, change came so slowly that a still shot was as good as video.
Until now.
As Susannah entered the room, she glimpsed an anomalous, bright orange spot in a lowland to the northwest. Nathaniel saw it too. He gestured and started to speak but she waved him to silence, taking the time to circle the room, scanning the entire panorama to assess if anything else had changed.
Her gaze passed first across a long slope strewn with a few rocks and scarred with wheel tracks. Brightly colored survey sticks marked the distance: yellow at 250 meters, pink at 500, green for a full kilometer, and bright red for two.
The red stick stood at the foot of a low ridge that nearly hid the tile factory. She could just see an upper corner of its bright-green, block shape. The rest of it was out of sight, busy as always, processing raw ore dug by the excavator from a pit beyond the ridge, and delivered by the mini-dozer. As the factory slowly rolled, it left a trail of tailings, and every few minutes it produced a new fiber tile.
Next in the panorama was a wide swath of empty land, more tire tracks the only sign of human influence all the way out to a hazy pink horizon. And then, opposite the door and appearing no more than twenty meters distant, was Destiny’s homestead vehicle. It was the same design as the approaching crawler: a looming cylindrical cargo container resting on dust-filled tracks. At the forward end, the cab, its windows dusty and lightless, its tiny bunkroom never used. Susannah had long ago removed the equipment she wanted, leaving all else in storage. For over sixteen years, the homestead had remained in its current position, untouched except by the elements.
Passing the Destiny homestead, her gaze took in another downward slope of lifeless desert and then, near the end of her circuit, she faced the tower itself.
The Martian Obelisk stood alone at the high point of the surrounding land, a gleaming-white, graceful, four-sided, tapering spire, already 170-meters high, sharing the sky with no other object. The outside walls were smooth and unadorned, but on the inside, a narrow stairway climbed around the core, rising in steep flights to the tower’s top, where more fiber tiles were added every day, extending its height. It was a path no human would ever walk, but the beetle cart, with its six legs, ascended every few hours, carrying in its cargo basket a load of fiber tiles. Though she couldn’t see the beetle cart, its position was marked as inside the tower, sixty percent of the way up the stairs. The synth waited for it at the top, its headless torso just visible over the rim of the obelisk’s open stack, ready to use its supple hands to assemble the next course of tiles.
All this was as expected, as it should be.
Susannah steadied herself with a hand against the high back of the couch as she finally considered the orange splash of color that was the intruding vehicle. “Alix, distance to the Red Oasis homestead?”
The same androgynous voice that inhabited her ear loop spoke now through the room’s sound system. “Twelve kilometers.”
The homestead had advanced five kilometers in the twenty minutes she’d taken to return to the cottage—though in truth it was really much closer. Earth and Mars were approaching a solar conjunction, when they would be at their greatest separation, on opposite sides of the Sun. With the lightspeed delay, even this new image was nineteen minutes old. So she had only minutes left to act.
Reaching down to brace herself against the armrest of the couch, she sat with slow grace. “Alix, give me a screen.”
A sleeve opened in the armrest and an interface emerged, swinging into an angled display in front of her.
The fires that had destroyed the Holliday Towers might have been part of the general inferno sparked by the Hollywood earthquake, but Susannah suspected otherwise. The towers had stood as a symbol of defiance amid the destruction—which might explain why they were brought low. The Martian Obelisk was a symbol too, and it had long been a target both for the media and for some of Destiny’s original backers who had wanted the landing left undisturbed, for the use of a future colonization mission that no one could afford to send.
“Start up our homestead,” Nate urged her. “It’s the only equipment we can afford to risk. If you drive it at an angle into the Red Oasis homestead, you might be able to push it off its tracks.”
Susannah frowned, her fingers moving across the screen as she assembled an instruction set. “That’s a last resort option, Nate, and I’m not even sure it’s possible. There are safety protocols in the AIs’ core training modules that might prevent it.”
She tapped send, launching the new instruction set on its nineteen-minute journey. Then she looked at Nate. “I’ve ordered the AIs that handle the construction equipment
