A profile is never motionless before our eyes, but it constantly appears and disappears. On account of the persistency of an image upon the retina, m… - Umberto Boccioni

.. the number of the engine [of the train], its profile shown in the upper part of the picture, its wind-cutting fore-part in the center, symbolical of parting, indicates the features of the scene that remain indelibly impressed upon the mind [of the viewer].

The sixteen people around you in a rolling omnibus are in turn and at the same time one, ten, four, three; they are motionless and they change places; they come and go, bound into the street, are suddenly swallowed up by the sunshine, then come back and sit before you, like persistent symbols of universal vibration. How often have we not seen upon the cheek of the person with whom we are talking the horse which we passes at the end of the street.

What was the truth for the painters of yesterday is but a falsehood today. We declare, for instance, that a portrait must not like the sitter.. .To paint a human figure, you must not paint it; you must render its surrounding [aura-like] atmosphere. Space no longer exists.. .Who can still believe in the opacity of bodies, since our sharpened and multiplied sensibilities has already penetrated the obscure manifestations of mediums? Why should we forget in our creations the doubled power of our sight, capable of giving analogous to those of X-rays?