If you were born before 1985, there’s a great chance you had dozens of them: Cassette Tapes. Wedged in between the age of wax and the advent of cold, digital perfection on CD, cassette tapes were the dominant format for music lovers of a certain era. And now, at the age of 94, Lou Ottens, the inventor of the portable tape, has passed away. The Dutch engineer reportedly hated reel-to-reel tape and set out to make something you could take along with you and fit in your pocket. Over 100 million cassettes have been sold in the world since their invention in 1963. R.I.P., Mr. Ottens.