Colours are categories, not distances
Red, Blue, Green, and Yellow each receive one category with probability 1/4. The wheel does not treat Blue as closer to Green than to Red, and it cannot infer a palette, brand guideline, or accessibility contrast from a colour name.
Picking a workshop marker
If four marker colours are equally stocked, Green has a 25% chance on one spin. In a set of 20 independent choices the expected Green count is five, but the actual count may differ. The calculation remains valid only while each displayed colour has one equivalent available item.
Availability precedes randomness
Do not spin first and discover that Yellow has run out. Remove unavailable colours before defining the wheel, and distinguish 'navy' from 'blue' only when they are genuinely separate choices. A duplicated shade silently doubles its chance.
Aesthetic decisions need more
A colour wheel can break a casual tie; it cannot assess legibility, colour-blind contrast, printing variation, or a client's identity system. Test those constraints separately.
Check the result in its medium
A chosen colour may look different on a projector, printed paper, fabric, or a phone set to night mode. If the outcome determines a visible label, test a sample under the actual lighting before ordering materials. The random draw can choose among approved swatches, but approval should include contrast and legibility tests rather than relying on the spelling of a colour.
Equal labels may hide unequal supplies
A craft table with one red sheet, one blue sheet, four green sheets, and one yellow sheet has unequal physical stock. Listing colours once deliberately gives colours equal chance, while listing every sheet gives Green four-sevenths probability. Neither method is automatically fair; they answer different questions. Decide whether the unit is a colour preference or an individual material before arranging sectors.
Before choosing a shade
Lay out the approved samples together and verify that each label refers to a real usable option. A wheel cannot correct a mismatch between a colour word and the material someone will receive.
Result record
Keep the selected swatch or its exact reference code when the colour must be reproduced after the informal choice.