ghia
No, not to see with Mapillary. Ugly perspective and against light. Dark grey mossy poles of approx. 10x10x15cm covered in the vegetation and the mulch. Along the Kloosterweg they are at the south side of it in the bank at half a meter height. There should be 4 poles opposite the Lindevijver and one halfway the grass field against the bended tormented tree.
https://www.openstreetmap.org/?mlat=50.76413&mlon=4.42779#map=19/50.76413/4.42779
Around the west side of the pond, there are several and 3 at the cape closest to the road.
https://www.openstreetmap.org/?mlat=50.76435&mlon=4.42334#map=19/50.76435/4.42334