Ten post boxes across Dublin at locations such as Stephens Green and Liberty Hall have suddenly turned red.
And some people were a little confused.
The painted - and still working - post boxes are designed to get people talking as well as acting "as beacons for the events they witnessed a hundred years ago".
It's all part of a project from An Post ahead of the centenary celebrations this weekend which they hope will draw people's attention to the lesser-known stories of the 1916 Rising.
Passers-by can text the word printed on the side of the boxes to the number provided to access videos of what would have been happening in that area during the Rising, when the post boxes would have been red.
As you know, before Irish independence, all post boxes were red. According to the An Post website, "one of the first acts of the new Irish Government was to order that green would be the new colour for Post Office letter boxes".
The reaction has been fairly positive online with a few wondering if it was the most appropriate of ideas.
Can we say that the Rising was really worth it when the post boxes on Grafton Street are still painted red? pic.twitter.com/xraLMqiphT— Gerard Farrell (@gerrytastic) March 20, 2016
This faux outrage over the red postboxes is ridiculous. They'll be getting a fresh green coat in a few weeks. Relax.— Mark Holt (@MarkHolt4) March 21, 2016
Nothing quite shakes up our Irish pride like seeing red postboxes around town #1916— Seán Defoe (@SeanDefoe) March 21, 2016
@Postvox A fantastic initiative. Well done. Love the videos. More to come?— Eamonn Coghlan (@EamonnCoghlan1) March 20, 2016
For more details, visit the website here.