21.5 “Likelihood of confusion”, by a consumer of average intelligence and imperfect recollection, is all that is needed. “Confusion”, again, need not extrapolate, in every case, to the consumer mistaking one mark for the other. It is enough – as Section 29(4) itself clarifies – if the similarity between the marks conveys an impression of “association” between them, to the mind of such a consumer. Again, all that is needed is “initial interest confusion”17 , without placing the marks side by side. In other words, if, on seeing the defendant’s mark some time after the first, the consumer of average intelligence and imperfect recollection is likely to pause, even if for the fraction of a minute, and ponder as to whether it was not the same, or at was not associated with, the plaintiff’s mark which he had seen earlier, the tort of infringement stands, ipso facto , committed by the defendant. The following passage from Kerly’s Law of Trade Marks and Trade Names, 9th Edn, was approvingly cited by the Supreme Court, in Parle Products (P) Ltd v J.P. & Co.18 :