The  "Hillary Clinton for President" "Hard Choices" book tour began on Tuesday in New York City where a crowd of thousands mobbed a Barnes & Noble to spend four seconds(!) with the former Secretary of State.

Parked close by was the "Ready for Hillary" bus, a motor-coach paid for by the super PAC hoping to pave the way for Clinton's 2016 presidential bid. "The bus — fondly named the Hillary Bus — will shadow Clinton at a number of stops on her national book tour, the group announced on Wednesday," reported BuzzFeed's Ruby Cramer. "The Hillary Bus will also travel to colleges, Democratic events, and state fairs."

The image above -- captured by Mashable's Ashley Codianni -- adorns the back of the bus. The picture, which was snapped aboard a C-17 military plane as Clinton jetted from Malta to Tripoli in 2011, shows Clinton staring at her BlackBerry while sporting sunglasses. It's become something of an Internet phenomenon over the past few years and even inspired its own (hilarious) Tumblr: Texts From Hillary.

While that was our favorite picture from day one of the Clinton book rollout, this one of a wall of "Hard Choices" -- snapped by BuzzFeed's Cramer -- is also pretty remarkable.