The concept is when the price on Tuesday or Wednesday broken and close above the Monday high, generally that potentially could be the "anchor" /high of the week hence the intraday trend of that week will rooted from this. Vice versa. Of course, this doesn't happen 100% of the time but it happens repetitively. Usually, this block (Tuesday-Wednesday) is, very often, the "final stage"/"final push" from the institutions with their price-fixing/stop hunts/liquidity hunt. It tends to extend until Thursday or Friday but generally, those block (Thursday-Friday) tend to be a profit-taking day for the banks