While 1 20ton vehicle climb might seem insignificant, 50 of these is 1000tons of balance upset, 500 of them is 10,000tons out of balance, and so forth.
Analemma Tower is a speculative idea for how this might be achieved some time in the future.
An analemma that includes an image of a solar eclipse has been called a tutulemma, a term coined by photographers Cenk E.
So a video of Winston Churchill playing tennis would be allowed, but a video of Theresa May playing ping-pong would not be.
The same technique can be used, , to estimate the time of sunset.
Even modern Supertankers make use of 'Kite Sails' to take advantage of favourable high-speed winds to vastly increase their fuel efficiency.