A luminous-heat-spirit with a translucent body of swirling thermal currents and tendrils of golden dust particles, hovering above a vast saharan erg dune at noon where mirage lakes shimmer on horizon and ancient petrified forest fossils emerge from wind-sculpted sand ridges, scientific field notes cross-section mapping thermal-convection cellular tissues and sand-erosion resistant membrane structures, palette of burning amber, sand gold, heat haze white and pale solar yellow, Victorian natural history desert expedition illustration aesthetic with intricate geological annotation callouts and crosshatched dune shading