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Well, the words seem to suggest that "Understanding is ??? (questions/questioning), but is this trying to convey that understanding is gained by questioning (which seems reasonable) or that the simple act of understanding is merely a continuous series of asking questions? My guess is it's probably both. As for the significance of the colored sphere and the block with the puzzle pieces, I don't think that whether the pieces are going up or down is really crucial to the message. I would assume that the point is to communicate that understanding is never complete and is full of diversity. If I had to sum up my guess on the meaning of the picture, it would be that there are always things to learn outside of the realm of human ability and that there are many different viewpoints that contribute to the common whole understanding.