Optical Illusion Bookshelf

Can you spot somethong interesting in this ordinary bookshelf?

If you fail, just scroll down to see the empty bookshelves for answer.

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Hope you see the subliminal message.

BTW, this interesting alphabetical and numerical bookshelf casings, built by Italian designers Eva Alessandrini and Roberto Saporiti of the Italian furniture design firm Saporiti, allows customers to choose individual letters to spell short phrases, dates, or other.

Also Watch :
Bias of Thoughts, another optical illusion bookshelf.