O'Brien, who gave him some Polaroid snaps of a PDP-11 system running UNIX along with some notions about visual puns having to do with pipes, demons/daemons, forks, a "bit bucket" named /dev/null, etc. Foglio's drawing showed four happy little red daemon characters carrying tridents and climbing about on (or falling off of) water pipes in front of a caricature of a PDP-11 and was used for the first national UNIX meeting in the US (which was held in Urbana, Illinois). Bell Labs bought dozens of T-shirts featuring this drawing, which subsequently appeared on UNIX T-shirts for about a decade. Usenix purchased the reproduction rights to Foglio's artwork in 1986. His original drawing was then apparently lost, shortly after having been sent to Digital Equipment Corporation for use in an advertisement; all known copies are from photographs of surviving T-shirts. The later, more popular versions of the BSD Daemon were drawn by animation director John Lasseter beginning with an early greyscale drawing on the cover of the Unix System Manager's Manual published in 1984 by USENIX for 4.2BSD. Its author/editor Sam Leffler (who had been a technical staff member at CSRG) and Lasseter were both employees of Lucasfilm at the time. About four years after this Lasseter drew his widely known take on the BSD Daemon for the cover of McKusick's co-authored 1988 book, The Design and Implementation of the 4.3BSD Operating System. Lasseter drew a somewhat lesser-known running BSD Daemon for the 4.4BSD version of the book in 1994. Use in operating system logos From 1994 to 2004, the NetBSD project used artwork by Shawn Mueller as a logo, featuring four BSD Daemons in a pose similar to the famous photo, Raising the Flag on Iwo Jima. However, this logo was seen as inappropriate for an international project, and it was superseded by a more abstract flag logo, chosen from over 400 entries in a competition. Early versions of OpenBSD (2.3 and 2.4) used a BSD Daemon with a halo, and briefly used a daemon police officer for version 2.5. Then, however, OpenBSD switched to Puffy, a blowfish, as a mascot. The FreeBSD project used the 1988 Lasseter drawing as both a logo and mascot for 12 years. However, questions arose as to the graphic's effectiveness as a logo. The daemon was not unique to FreeBSD since it was historically used by other BSD variants and members of the FreeBSD