The tape used in the tape machines is a variety of decorative tape made by 3M. 3M only sold it in four-inch widths, so it had to be slit by hand to two-inch widths to fit in the tape machines. When filmed, they were astounded at how gaudy it looked, so to dampen its brightness, the prop crew wound the tape back and forth across a sander to dull its brilliance. "One of those things that actually looked a lot better on film when we finished with it,"
Douglas Trumbull commented.
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