This article piqued my interest. It says that the experts are struggling "to explain the meaning behind some of its details" - referring to various designs by Charles Rennie Mackintosh for a church in Glasgow, including one of birds and bees. Apparently he left no written record of what the designs mean.
There are lots of theories, including [yawn] fertility/sexual reproduction, and claiming that the church is 'Pagan in feeling'.
Has anyone ever considered this? There might not actually be a meaning! He might just have done it because he liked it. I love some of CRM's work, but I don't have to find a hidden meaning, I just find it pleasing to the eye. Why is there always this search for meaning? It's just nice, so accept it.