The article could have mentioned Skyhook [1], which can be built with existing materials.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Skyhook_%28structure%29" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Skyhook_%28structure%29</a>