Farmville recently started showcasing farms on the loading screen. One farm in particular has many farmers scratching their heads…

This farm depicts what looks to be hedges and fences stacked upon one another. This is in fact an optical illusion caused by the isometric perspective of the game.
Isometric perspective is an unrealistic perspective in which parallel lines do not converge at vanishing points. Most games use this type of perspective so that sprites don’t have to be changed based on their placement on the playing field.
If you want to achieve this effect, the way to do it is simple. Just place multiple fences behind one another with one unit of space between them and align the posts of the fences. There’s nothing fancy to it!
View the work of MC Escher for some inspiration on perspective related optical illusions.
