I have only a vague idea of what the meaning of this is. (I did NOT paint it in two minutes btw)*It's only one bonus speedpaint so I decided to put it into this post
Perhaps after thousands of years of hesitation, the machine is covered with shrubbery, the megaliths damaged. Humans cannot see the obvious they are all focused on the stones unaware that a few centimetres under the shrub rests something more important and of greater meaning.