flash on 2016-3-20

a tornado made of text

"ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 
create letter 
set positions
respawn at the bottom
radians
stabilize letter at a radius which increase as y decreases
updraft
seen from above,
z is the new x, increasing rightwards
x is the new y, increasing downwards
get new z, x positions
and add back to ctr