Reading tape is undoubtedly the purest form of trading. It is definitely one of the most misunderstood forms of trading, it's a skill that virtually all short-term traders would love to master, and it is also very difficult to find any useful information about on the web. The little bit of information that does come up on a search engine is frustratingly stupid, usually a YouTube video of a novice yelling out something like 'lots of red on the tape, lots of red - I think I need to short'. So if you're all about losing money, be my guest and jump into the position after you see the waterfall. Usually that entry is way too late and for all the wrong reasons.