An echo of Unternehmen Seelöwe

Back in April of last year I blipped a concrete world war 2 tank trap that had been richly decorated with images of Winston Churchill and Adolph Hitler. The caricatures were the work of one Louis Lawson who was doubtless one of the soldiers who built the defences in the dark days of 1940, as Hitler prepared to invade this Sceptered Isle. The planned invasion was known as Unternehmen Seelöwe, Operation Sea Lion.

Today, I came across another example of Louis' work on another tank trap that has just been exposed from the sand by the recent gales and high tides. This is a much simpler creation, dated 1940, and consisting of a geometric design and signed "Louis".

I have no idea what the design signifies, perhaps it was just a whimsical product of Louis' imagination, but then again it may represent something tangible. Does any-one out there in Blipland recogonise it?