Sentence:  As one would surmise , the procedure , however , could be repeated with the same <WSD>object</WSD> or with the same type of object often enough , so that the corresponding visual blots and the merest beginning of the tracing movement would provide clues as to the actual shape , which the patient then immediately could determine by a kind of inference . 
Meaning of the word marked with <WSD> tags:  a tangible and visible entity; an entity that can cast a shadow