The "Sea of Time" is sort of creepy for those afraid of mortality and aging.
The weird maths equations, soundwave diagrams (the only live-action effects within the movie itself), and Andy Warhol-esque portraits of the Beatles floating in the Sea of Science, along with George's creepy, passive-aggressive "Only A Northern Song", make for one of the most inexplicably disturbing moments in the film.
Jeremy. In his entirety. Every single moment. Always.