Common Sense Evaluation

First, a one that is no fool
Though he resembles a gardener’s tool

Next, one difficult to split in two
And a girl once had one as big as her shoe

Then, to the mind, one’s a lovely bonder
And truancy makes it grow fonder

Last, a stem connecting dots of three
Knowing all this, what are we?
 

Come to rest on petals of brightness.
All can see, my change is cast.
I flutter by in paper lightness.
And my species, they are vast.

Darwin wrote of my pure beauty.
I’m collected, caught in nets.
Forever free to dance my duty.
Never kept as pets.