Leaf Monster
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The scissor mechanism is placed 15 to 20 feet
in the air.  When in the retracted mode, you
see a small pile of leaves or such.  When the
scissor extends, the pile of leaves grow into a
20 foot tall monster.
Thrust bearings were used at the central pivot points to see
how they would perform for giving a smooth, easy movement
for the scissor mechanism.
This is the vertical tube that is attached to the tall pipe.  It provides
the horizontal stability of the scissor mechanism by a 24" drawer slide
and is the air cylinder mounting piece as well.