There are some other optical issues... At zoom 30m in the left corner, you see in yellow more or less the playground used by Chamgagnat. You also see a non-permanent tissue roof covering part of it. If you zoom in to 10m rests of both stay visible and between Heilige Familie and Babelmet a strange triangular appears... Helmetsesteenweg 214 has a passage on the ground floor which serves as entry for both schools. You could add the strip of ground behind this house to the yellow playground as the ground between the buildings of Hl.Familie, upt to the line formed by the backwall of Rue Vandevelde 30...
