Slightly cracking plaster top corner or external wall in living room

Got some slight cracking in the top corner or my living room... external Brick walls no cavity and plaster on top. What you guys think is the cause? Not concerned just curious so going to keep an eye on it.
Cheers...
 

Attachments

  • IMG20240201212121.jpg
    IMG20240201212121.jpg
    2.8 MB · Views: 43
  • IMG20240201212128.jpg
    IMG20240201212128.jpg
    3.4 MB · Views: 40
Top