Lane Markers

In the boating season lining up these two triangles helps you to follow the deep water channel.  However, at this time of year they are rather redundant.
The average January temperature here is minus 8°C, but today it was plus 8°C. The snow is rapidly disappearing from Claire's garden and large puddles are appearing on the ice.  If the trend in global heating continues those lane markers will soon be needed even in January.