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ArtistIn the middle of the picture is a tall huge red 1 kilogram weight. Around the weight are three concentric white rings, on a black background. The rings are closer to each other at the left of the picture and further apart from each other at the right of the picture.
In the middle of the picture is a 1kg weight, accelerating to the right. Around it in white are shown the gravito-geodesics. These are more bunched-up at the left (and more spread-out at the right). Since these geodesics only propagate at the speed of light, they lag behind the motion of the 1kg weight. This results in a gravito-inductive force which pulls back on the weight, F=ma (where m is the 1kg mass and a is its acceleration). This explains why there is a manifestation of inertia.