From the Metropolitan Museum of Art:

[Opium Smokers], Pun Lun (Chinese). Date: 1870s. Medium: Albumen silver print. Classification: Photographs. Credit line: Gift of Weston J. Naef, 1985. Accession Number: 1985.1123.1.12


Opium-smoker, detail.

Opium-smoker ,detail view from inside.

Reference image for Opium-smoker. Pun Lun, Opium Smokers, 1870s.
Source: The Metropolitan Museum of Art,
http://www.metmuseum.org/Collections/search-the-collections/190016149?rpp=20&pg=1&rndkey=20130109&ft=*&deptids=19&where=China&who=Pun-Lun&pos=1 detail.



Edited image for Opium-smoker for the Plexiglas engraving.