FWIW, erster Treffer für "a wall of gratitude" (im OP-Link ergänzt) :
... Wall of Gratitude could help to improve mental health and wellbeing
Wall of gratitude is giving people in Sheffield a chance to highlight some of the things they are most grateful for
Wall to be built using bricks that each contain a personal message of gratitude
University of Sheffield project could be used as a tool to help improve mental health and wellbeing
Studies show gratitude can have beneficial effects for people’s wellbeing
A Wall of Gratitude, which is giving people in Sheffield a chance to highlight some of the things they are most grateful for, is set to be unveiled by researchers at the University of Sheffield.
Built using “gratitude” bricks that each display a personal message stating things that people are grateful for, the wall could be used as a tool to help improve people’s mental health and wellbeing.
The project, led by Dr Fuschia Sirois from the University’s Department of Psychology, is encouraging people to take notice of the things around them they are grateful for and share them on a temporary wall that will be on display for others to view in Sheffield city centre. ...