Or to give its full name, the Tesla's Valvular Conduit.

Choose from one ginormous one, or lots of little ones, in a block.

No, I'm not trying this one out myself.
-- not_morrison_rm, Mar 19 2017

Tesla's Valvular Conduit https://en.wikipedia.org/wiki/Tesla_valve
[not_morrison_rm, Mar 19 2017]

Ah yes, I can completely see the point of this. It's cunningly designed so that when you're descending, the Valvular Conduit blocks the flow of air, much like a normal round 'chute. But when you find yourself falling upwards, as happens from time to time, the air passes easily through and you are not impeded.

Obviously not of much use in those parts of the world where the gravity only points downward, but elsewhere it would be a real boon.
-- MaxwellBuchanan, Mar 20 2017


Possibly bolt about a thousand together in the shape of an airfoil and glide to the ground?
-- whatrock, Mar 20 2017


Of course, a Tesla valve driven rapidly up and down should generate lift.
-- MaxwellBuchanan, Mar 20 2017


We will pay a dollar, cash money, to see that.

<ostentatiously places very used, dirty, crumpled US one-dollar bill on table, in puddle of spilled beer>
-- 8th of 7, Mar 20 2017


<drinks remainder of [8th]'s pint; leaves him to retrieve his now sodden life savings>
-- MaxwellBuchanan, Mar 20 2017


<ponders challenge>
<...and lotto winning odds>

<smiles>
-- 2 fries shy of a happy meal, Mar 20 2017



random, halfbakery