[Sal the Mudokon]

If you look, there are roots growing in and out of the monoliths of the monsaic lines, but there are also pieces of ground suspended in the air by amazing root systems. It's highly probable that this shows a greater way of constructing art, over massive lengths of time by slowly "pruning" nature into the living shapes of the amazing giant Mudokon warriors or the Scrabs and Paramites to which the lines were built. Though I do agree that the gargantuan statues that adorne the entrances to the lines appear to be carved, but we know that levitation is not beyond the ability of mudokons, individually. Maybe a single mudokon could spend a lifetime on a masterpiece of that grandure, with the ability to rise and lower and perfect his work. Carving it from top to bottom, rather than bringing in resources from the planet to build upward as humans do. It's much the same concept as the statues of terra featured down the road, except with rock. ...a sort of bonzai Collosus.