supertux/data/images/objects/unstable_tile/iceplatform.sprite

(supertux-sprite
  (action
    (name "normal")
    (images 
      "iceplatform.png"
    )
  )
  (action
    (name "fall-down")
    (fps 0.2)
    (images 
      "iceplatform.png"
    )
  )
)