This guy was doing a bit of renovation work inside one of the buildings in the square around the cathedral.
More "posers" near the bar Ernest Hemingway used to frequent.
There are hundreds of these old retired guys in red shirts all over Cuba. They don't have a retirement plan, so their "job" is to wear the red shirt and "mind" the cars that park in their area. When you return to your car, you slip the guy a peso or so for keeping "watch". Over the course of a day they could make between 10 and 50 pesos ($13-$65), depending on the location of their "area". In a two or three days they easily eclipse the monthly salaries of doctors and engineers (both earn approximately $40 Cdn/month).