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Video with more elaboration as gif

Horizontals in a grid do not cast shadow while verticals do. Why is this?

A friend shared this image and asked about the shadow. As it appears the horizontals are not casting a shadow while the verticals are. It seems that the light source is on the left hand side wall, based on the vertical shadows. So how can this be? (https://i.sstatic.net/pHYB7.jpg)

Edit 1 - Not very clear but an image with the source of the light. https://i.sstatic.net/WzhoT.jpg

Edit 2 - A gif from a short video of the table under the light. https://giphy.com/gifs/2uInVzY9vOBwbmh4Nw

Edit 3 - Another friend suggested that it might have something to do with the principles behind Young's double slit experiment (an answer says its not, I agree)

Edit 4 - https://giphy.com/gifs/jVEUnP6fiah53zdMcp A video made in to a gif with the grid being moved around and the source of light shown in relation to the object