I highly recommend a book called "Spaceland" by Rudy Rucker. It's like a modern take on "Flatland". In it a Silicon Valley hotshot gets visited by a 4th dimensi

I highly recommend a book called "Spaceland" by Rudy Rucker. It's like a modern take on "Flatland". In it a Silicon Valley hotshot gets visited by a 4th dimensional entity called Momo. He also wrote a book called "The 4th dimension" which explores the concept historically and in various ways.