Illusion cannot equal or be the same as mystery; nor, definitely, delusion. Probably, it may be the difference between real and unreal.

Illusion is mostly make-believe, and generally explainable by most or at least some. Mystery, on the other hand, may prevail symbiotically with ignorance. It is not illusory, visually or audibly: it is just something unexplainable to some, and easily understood by others, and treated with scepticism by the rest. Delusion, of course is being completely out of touch with reality, and has no relation to either illusion or mystery. Its closest ally is grandeur, gullibility, and punishment or exploitation.

Illusion fascinates mankind in myriads of ways, mostly visual.

(This illustration is from a Honda institutional ad, and is named by them Endless Flow. Note: the water seems to be flowing downward from one point; theoretically it should end at another point, which would be the bottom, but in the illustration it flows down continuously, as well as climbs up continuously.)

Among man-made illusions, two-dimensional art forms are the commonest, but most imaginative and creative. M.C. Escher, the Dutch artist, devoted a great deal of his work to creating such masterpieces, from which the above illustration has been directly derived. Here is the original (it is a march of soldiers, climbing up and down, up and down, endlessly):

Whether he himself was inspired by some Greek or ancient, definitely western, artistic, philosophical, concepts, I am at the moment not in a position to confirm. But he did a great deal of work, inevitably, because it is unavoidably obsessive. He has many followers, drawing equal amount of fascination.

Let me join others who have wondered, or those who are reading this blog, as to whether, given three-dimensional reality, can this illusion of endless march, or endless flow, or endless whatever, be physically produced, and therefore converted to non-illusion and three-dimensional shape conforming to existing laws of physics and science.

Of those who spend time on such speculation, most just show fascination and confusion, and do not traverse to convert the notion as illusory or physically possible. Some believe that, given means, models can be created in three-dimensions, with wood, steel, cardboard or other materials, or even bricks, to establish the concept of continuum.

I have not been casual on this matter, as I am obsessively seeking clarity in every sound and every sight. I have been able to prove that this illustration belongs totally to the concept of visual illusion made possible by elimination of third dimension, by drawing it on a flat surface. To prove this, the clinching argument that I have provided is that to produce this physically would require the knowledge of the highest and the lowest points in the illustration or drawing. If you observe the picture, you will find that all points are either the highest or the lowest, at the same time. It is therefore not manufacturable into a real object, and therefore scientifically unviable.

Einstein said 'God never plays dice.' Since, according to me, there is no God, only human beings play dice. Interestingly, they have no other choice because of the caprice of life itself. It is fun, therefore, to defy science and glimpse the unreal, and be pleasantly fascinated by one of the most harmless aspects of man's creative mind.