Unsurprisingly,
it's not really visible:

I only really meant to make one - the middle ranks, they're the most invadery.
( Fronds are waving gently on, Fri 17 Jan 2003, 20:57, archived)

best adjective of the night
so far
( rosey on twitter as @helenelectric, Fri 17 Jan 2003, 21:09, archived)