seed of blue rain

This morning while I entered my room,
I saw a strange thing lying on the floor, not knowing what it was.

Picked it up, and before throwing away, gave it one more glance.
Then I saw it was a seed....
immediately I knew where it came from.
On my 'lost-and-found' place I had put last week a seed from the wisteria-tree.
In dutch called 'blue rain'.
I liked the seeds that had formed last year on the tree, so left them during winter, but now one of the seeds had fallen off, and I put it inside.
There the seedcontainer had dried, so the seeds jumped spontaniously out!