Here is a Processing sketch that calculates magical probability per Peter Carroll’s first three equations of magic from Liber Kaos :
- M = GL(1 − A)(1 − R)
- Pm = P + (1 − P) × M1/P
- Pm = P − P × M1/(1 − P)
Use the blue sliders to manipulate the variables. The green and red bars show how natural (P)robability is adjusted by the amount of (M)agical power — (G)nosis and (L)ink increase magical power, (A)wareness and (R)esistance decrease it. The green bar shows magical influence on manifesting a desired outcome (→ 1.0); the red bar shows magical influence on preventing an undesired outcome (→ 0.0). Both bars become brighter as magical power increases.
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