Last week I was researching delta time; the concept of change over time, and stumbled across the delta symbol itself. You know it: the triangle-shaped mark, Δ. Uppercase delta. It represents difference or variation. I'd seen it scattered throughout my life before, but I'd never really seen it.
Then something happened.
A few days later, I was shopping for a dishwasher at a local appliance store. Our current one had just quit. I was browsing the different models when I spotted it: the Frigidaire logo. There, embedded in their branding, was the delta symbol. Clear as day. A triangle pointing upward. Excuse me?
I'd walked past Frigidaire products a hundred times. Never noticed it before.
But here's where this gets interesting. The delta symbol appearing twice in a week isn't a coincidence. It's not the universe sending me a message. It's something more mundane and somehow more fascinating: my brain got tuned to recognize a pattern, and now it's finding that pattern everywhere.
This phenomenon has a name. Psychologists call it the Baader-Meinhof effect, or frequency illusion. Once something enters your awareness, you start spotting it in the wild. It's not that the thing suddenly became more common. It was always there. Your attention just wasn't primed to catch it until now.
The clearest example of this happened years ago at Ontario Mall in Ontario, California. A friend and I were walking and talking about shoes; specifically, bright orange shoes. We weren't admiring them. We were laughing at them. Who would wear something so bright and garish? We both agreed: nobody with taste.
Moments later, we passed a Payless Shoes store. The window display was advertising a pair of completely orange shoes.
We both stopped. We both stared, and then we both shrugged it off.
But think about what actually happened. Those shoes were in that window the whole time. The Payless store existed before our conversation. The orange color existed. The odds of us walking past that exact display at that exact moment were probably unremarkable, after-all, it's a busy mall. But because we'd just talked about orange shoes, our brains were primed to notice them. Our eyes locked onto that color. The coincidence felt electric.
That's the Baader-Meinhof effect and if you look it up; it's pattern recognition gone hyperactive.
Once you know about frequency illusion, you see it everywhere (which is, ironically, another example of it). You learn about a word you've never heard before, and suddenly that word appears in three conversations the next day. You decide to buy a specific car, and you see that model in every parking lot. You become aware of a concept, and your mind starts running a background search for it, automatically, without you asking.
It's not magic. It's not the universe conspiring to confirm your thoughts. It's just how attention works. Your brain is a pattern-matching engine. It gets more efficient the more data points it collects. Once delta became salient to me, my mind started filtering the visual world for triangles and change symbols. It found one.
The serendipity of it all; finding the dishwasher on that specific Sunday, spotting the logo right when I needed to notice it, that's where things feel less explainable. Coincidence? Heightened alertness? Both? I'm not sure.
The honest answer is: it doesn't matter much which frame you use. The effect is the same either way. Once something matters to you, you see it. Once you see it, it matters more. The loop tightens.
What's worth thinking about is this: how many patterns are you not seeing right now because your attention isn't tuned to them? How many connections exist in your life that you're walking right past, the way I walked past that Frigidaire logo a hundred times before?
Most people let that question slide. They see the orange shoes or the delta symbol, feel a little surprised, and move on.
But if you pause long enough to notice, to actually think about what you're noticing, something might occur. You start seeing the invisible patterns. And once you see them, you can't unsee them.
That's where the real serendipity lives.