How to Draw Skyscrapers Optical Illusion

How to draw skyscrapers optical illusion. You will notice that although I draw 4 towers if you look towards the bottom only 3 appear to exist..

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Music details below:

'Local Forecast' Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/