Ostensibly, it was around 1850 a.d. that Persians invented this hot air balloon variety; in which there is a fire in a fire pit up on a platform accessed by stairs on the ground; a fire that heats up the air within the balloon whilst the balloon is yet still on top of the platform; which said hot-air balloon then later lifts off up into the air because of hot air having less density and thus causing buoyancy of the balloon.