Used trend:

STILL YOUNG

Designed by low key Design from China in 2007.
Uploaded to Trend List 2 years ago.
Tagged as Conceptual, Helvetica, Corporate, Identity, Envelope, Pen, Pencil, Letterhead

Quoted from
https://www.behance.net/gallery/136071427/STILL-YOUNG-INTERIOR-DESIGN-COMPANY-VISUAL-IDENTITY