I'm a concept artist specializing in vehicle design. I design the units and vehicles for the upcoming game Aero Empire, and I regularly submit concepts to the indie project Infinity: The Quest for Earth...
A concept of what a "tank" would be in Infinity (since the ease of flight has rendered common tanks useless). Low altitude propulsion would only benefit units that gain more advantage from being rooted to the ground than flying in the air. The line dividing armor and fortification begins to blur...