Doing some more visual design technique research. Nikita Nikiforov shows a very interesting visual feature on his website Nikita Nikiforov.
.gif below or visit the website to see it in action.
How might this be achieved? Being part graphic design, part web design related, this question might also need to be posted in the stackoverflow community, but I'd like to try here first.
(No stealing of intellectual property intended, all credit goes of course to the original designer, I'm merely interested in broadening my horizon in regards to visual techniques)