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When you see an actor or musician in a costume designed by Newman-Thomas, the outfit looks authentic in a way that is almost unnoticeable — and this is the point.

But for others, cognitive decline may start as a worrying but clinically unnoticeable step toward cognitive impairment, be it relatively mild or as severe as Alzheimer's disease.

Body dysmorphia leads a person to spend a lot of time worrying about flaws in their appearance, and often these perceived flaws are unnoticeable to others.

Another group’s bus carried a rainbow flag in support of the LGBTQ+ community, but it was so small that it was almost unnoticeable.

At first, Mr Dhall said the walk felt like "an unnoticeable ripple" as the participants went back to their lives.