A pane of glass in a window
See 
Noun
 very thin translucent flounder of the Atlantic coast of North America
Noun
 a pane in a window; "the ball shattered the window"
n.
 See Pane, n., (3) b.
n.
 A thin, spotted American turbot (Pleuronectes
   maculatus) remarkable for its translucency. It is not valued as a food
   fish. Called also spotted turbot, daylight, spotted sand flounder, and
   water flounder.
Windowpane
See 
Usage Examples
Good writing is like a windowpane.
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Other Usage ExamplesIt is also true that one can write nothing readable unless one constantly struggles to efface one's own personality. Good prose is like a windowpane.