How many lines are necessary to erase a black rectangle?

How many lines are necessary to erase a black rectangle?
http://www.rgbdesigndigital.com.br/atravesdoespelho/howmanylines/

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andrei

http://www.rgbdesigndigital.com.br/atravesdoespelho/


"First of all you can't be subversive without being subversive to yourself, that's very important. You miss something crucial if you think subversion means to have clearly defined enemies and act against them. The enemy always is always you, too and in the first place."
http://www.koreawebart.org/2001/0100101110101101org.html

Andrei R. Thomaz
www.rgbdesigndigital.com.br
www.atravesdoespelho.hpg.com.br