Move towards the back wall from the canyon so Vogel fires for the 2 purple-and-silver tanks there. Make use of the bits still left behind to construct a sprinkler, which then triggers a beautiful flower yard to sprout. After a couple times, the sprinkler explodes and artifact piece #6 appears. https://desert-block-puzzle-walkt75284.suomiblog.com/best-desert-block-puzzle-game-things-to-know-before-you-buy-51552884