Havana ? New photographs of a smiling, tracksuit-clad Fidel Castro greeting workers at a scientific think tank were posted on the websites of two Cuban journalists Saturday, offering a rare glimpse of the reclusive revolutionary leader in a public forum.

Castro, 83, appears slightly stooped but otherwise healthy in the four pictures, which were apparently taken Wednesday with a worker’s mobile phone. The former Cuban leader is seen raising his hand to wave in one picture and apparently being led away in another.

“He is thin but he looks good, and according to our director, he is very good mentally,” reads a comment accompanying photos on the blog of Rosa C. Baez, a journalist who works for official Cuban media.

The comments were sent to her along with the photos by an unidentified Cuban worker, who said Castro stopped, said hello and blew kisses to the employees.