Enjoy the World of Cartoons

I will be grateful if you give me an explanation why this cartoon named "terra firma" is funny for you, where is the humoristic point? I showed to other personnes and nobody divine where is the gracious point. Possible the ingenuity extreme with the absurdity of the childy drawing? Is the arcaic lader in contrast with the futuristic spaceship? the inverosimile crature looking a hole that match his home..the earth means that the scene is in an orbiting asteroide/
..the perspective to show the craters are very bad drawed..is not the moon....Much of these stupidity shows the degrading state of people now and you see in the contests much of these works obtaining prizes..only because is made for one of them. Please give me clues, tips I'm curious to see how posibly my mind is not working properly like the creator of these work.

hahahahaha!