You must have heard about the invisible gorilla experiment. If not, you can learn more here or actually there is another version of it that I like better, you can check that out here . No matter which one you like/watch/read the main thing here is when you have to perform a task (especially if that is a challenging one), without realizing it, your attention narrows and blocks out other things. So, often, you literally can't see even a huge, hairy gorilla that appears directly in front of you. 😀 That effect is called "inattentional blindness". You only see what you expect to see. I was first introduced this experiment in the context of modeling. With any models you are working with, you need to work hard not to only see what you expect to see but way more beyond that. The other day I needed to schedule a "trip" to the customer service of an internet/phone provider (I needed to arrange internet subscription for someone in my family). But a lot was g