It’s a glass laser block! I used my green laser pointer on glass blocks in the lobby at building 100 at Daytona State College. This was a lot of fun and I enjoy effects like these. I used a six-second exposure and positioned my Canon Rebel XTi on a makeshift tripod and used the 10 sec. timer to avoid jostling it.

Canon Rebel XTi, EF 50mm 1:1.4,

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This work is licensed under a Creative Commons Attribution 3.0 License. Please credit me as Richard Thripp.