Minecraft: How to build a simple Smart Shifting Floor Mob Trap, Redstone Showoff

Showing off one row of a tileable simple smart shifting floor design which i used for my Witch farm. I have no clue who came up with the idea or concept first but the idea using a hopperclock just rocks, so i used it and came up with this dsign for my survival let's play series.

Worldfile download: https://www.mediafire.com/?pm1fyqkevkjgj5y

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----- bloXCentric links and additional information -----

Official website: http://www.bloXCentric.com/
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bloXCentric is a private, whitelisted, vanilla, survival, multiplayer server started in january 2013 for video recording and streaming purposes.
The only way to join is getting invited, we are not accepting applications.

------ used Music ------

"Run Free" by UR Music
https://soundcloud.com/ur-music/run-free
CC-BY http://creativecommons.org/licenses/by/3.0/