How Your Lucky Color, Direction and Number Are Actually Calculated
A lucky color and a lucky direction look like two separate facts. On Bokki's home screen they are the same fact, read off the same single element through five different classical tables — twice, from two different sources.
Bokki Editorial
The short answer
After you submit your birth details, Bokki's home screen shows a block of "lucky items" split into two layers with a note on each explaining which is which. The lifetime layer never changes: it comes from your chart's favourable element (用神), and it names a color, a direction, a pair of two-hour windows, a pair of classical numbers and a taste. The today layer resets every day: it comes only from today's day-pillar stem, so the same five kinds of item point somewhere different tomorrow. Some rival apps hand you a color and a direction and stop there — Bokki shows the element behind both and names which of two different calculations produced it.
The arithmetic — one element, five classical tables, and one honest override
Once Bokki has an element — Wood, Fire, Earth, Metal or Water — the five items are plain lookups into tables with real classical citations: colour from the 五方正色 (five direction colours) of the Huangdi Neijing's Jinkui Zhenyan Lun, compass direction from the same passage's element-to-direction seating, the two-hour windows from the twelve 十二時辰 branches grouped by element (Earth alone gets four windows because its four branches sit at the tail of each season), the number pair from the River Chart's (河圖) 生數/成數 birth-and-completion numbers, and taste from the same Jinkui Zhenyan Lun passage's five flavours. None of these five tables is invented — each line traces to a named classical source, and Bokki's own source comments say so. The one place judgment enters is which element to feed the lookup for the lifetime layer: the chart's raw strength arithmetic (抑扶, using strength alone) names one element, but if the chart runs unusually hot or cold, a second rule (調候, seasonal climate) can override it — and when it does, Bokki's copy says both numbers instead of hiding the disagreement.
Worked example — one override, one symmetric pairing, one changing day
Take the chart Bokki's articles on 대운, 십신, 수호신 and the daily radar already use: born 15 May 1990 at 14:30 in Seoul, a weak Metal day master. By strength alone (抑扶) this chart needs Earth. But the chart runs hot, so the climate rule (調候) overrides that to Water — and the lifetime layer follows the overridden answer: black, North, the hours 21:00–01:00, the numbers 1 and 6, and a salty note, all traced back to Water. A contrasting chart — 2 November 1988, 09:10, Busan, a strong Metal day master used in Bokki's articles on 화개 and 격국 — needs Wood by strength alone and the climate rule agrees, so its lifetime layer is a plain, unoverridden Wood with no second number to report. The two charts' day branches also form a matched pair through the 六合 (six-harmony) table: the 1990 chart's day branch 辰 partners with 酉 (Rooster), and the 1988 chart's day branch is exactly that 酉, whose partner is 辰 (Dragon) — the table is symmetric, so each names the other. The today layer, unlike the lifetime layer, moves with the calendar alone: for the 1990 chart, 3 September 2026's day pillar is 庚辰 (Metal, one of this chart's favourable elements — a "boon" day), giving white, West, 15:00–19:00, 4 and 9, and pungent; eight days later, 9 September 2026's day pillar is 丙戌 (Fire, the element this same chart's engine marks unfavourable — a "tax" day), giving red, South, 09:00–13:00, 2 and 7, and bitter. Same person, same code, different day.
What we don't compute
Bokki's own source comments name three things left out on purpose. First, specific objects — the five-element correspondence to modern things like a television or a phone has no documented classical basis, and inventing one would only look precise. Second, blood type or a "junior colleague" the classical color-and-direction table sometimes travels with in casual apps — that pairing comes from a 20th-century Japanese fad with no link to this tradition, so the only person-facing item Bokki keeps is the six-harmony partner branch, and even that names the branch without ranking or scoring the person who holds it (D-003). Third, specific dish names — the 五味 (five tastes) table stops at "something with a salty note, food that is black"; naming an actual recipe would be invention dressed as tradition, and this is guidance for choosing a meal's character, not dietary or nutritional advice.
Closing note — one element, five tables, two clocks
In short: Bokki's lucky items are not five separate guesses. They are five classical lookups fed by a single wuxing element, read from two different places on purpose — your chart's own favourable element for a layer that never changes, and today's day-pillar stem for a layer that resets with the calendar. A weak, heat-leaning chart's true favourable element only becomes visible once the climate override is applied, and the same chart's daily layer swung from a full "boon" set to a full "tax" set in eight days without the person changing at all. Nothing here is arbitrary, and nothing here claims more precision than the classical sources it cites.