Not to be confused with Slideshow Cassette 2
The Slideshow Cassette 1 is an Inventory Item that can be used in the game.
The Slideshow Cassette 1 is a small oblong draw filled with projector slides. The front of the draw has a curved metal handle and a white Roman numeral one. Slideshow Cassette 1 has slides showing some of the fauna in Machinarium.
The Slideshow Cassette 1 can be found in the front of the wooden desk.
Josef can simply pull out the Slideshow Cassette 1 from the front of the wooden desk.
The Slideshow Cassette 1 can be placed in the slide projector to view the slides. Viewing the slides will give Josef a clue on how to exit the Glasshouse (See: Glasshouse Control Box Puzzle and Glasshouse Door Puzzle)