Gherkin, Agbar, Cocoon
I have travelled Europe for 3 months six years ago.
Firstly I went to London, and I saw this building many times.

It's "30 St Mary Axe (the Swiss Re Building)".
With 40 floors, 180 metres tall, designed by Norman Foster, opened 2004.
Also known as "the Gherkin (the Cucumber Building)", due to its appearance.

After travelled UK, I went to continental Europe.
In Barcelona, I really surprised when I found this building looks like the Gherkin!

This is a office building "the Torre Agbar".
With 38 floors, 144.44 metres tall, designed by Jean Nouvel, opend 2005.
Local people call it "el supositori (suppository)"... due to its appearance.

In Japan,
when I see "Mode Gakuen Cocoon Tower" in Shinjuku, Tokyo,
I remember above two buildings.

It's a educational facility with 50 floors, 204 metres, designed by Tange Associates, opened 2008.
It was designed in the image of cocoon.
Well, well, I like these three cities :)