Just around the corner on Johnson Square, Lee Heidel started to feel nauseous as he stared at his computer screen.
"I couldn't tell if I was moving or the screen was moving or a little bit of both," said Heidel, a Web developer who was working on coding just before 2 p.m.
He asked his wife and co-worker at Heideldesign, Ginger, if she felt anything.
"I didn't preface it with anything so as to not influence her, but she said, 'Yeah, something's weird,'" he said.
After Ginger noticed the blinds slowly shaking they joked it was an earthquake, but attributed it more to construction on nearby Ellis Square. It wasn't until he opened Twitter a half hour later and saw a flood of earthquake-related posts that they realized it was no joke.