Cairo's Tahrir Square was the epicenter of the successful Egyptian Revolution of 2011 that shook the country's old governmental structure to its very core.
That revolution led directly to the fall of one autocrat, Hosni Mubarak, who was ousted as president last year, and indirectly to the rise of another, Mohammed Morsi, who was elected as president as the candidate of the Muslim Brotherhood's Freedom and Justice Party this year.
Photographs of the demonstrations in Tahrir Square then are burned indelibly in one's mind, and pictures of the protests there now bring many of the old ones back into crystal-clear focus.
Mubarak and Morsi may or may not be similar in their exercise of power, but the images captured in Cairo's Tahrir Square Friday indicate a sizable number of their countrymen and -women might not be seeing any significant difference between them at this time.
Check out 10 of the more evocative photos here.