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

(supertux-sprite
  (action
    (name "normal")
    (images 
      "brick-0.png"
    )
  )
  (action
    (name "dissolve")
    (fps 10)
	(loops 1)
    (images 
      "brick-0.png"
	  "brick-1.png"
	  "brick-2.png"
	  "brick-3.png"
	  "brick-4.png"
	  "brick-5.png"
	  "brick-6.png"
	  "brick-7.png"
	  "brick-8.png"
	  "brick-9.png"
	  "brick-10.png"
	  "brick-11.png"
    )
  )
  (action
    (name "fall-down")
    (images 
      "brick-11.png"
    )
  )
)