Inkblot (noun)

1. A stain or spot made by ink.
2. A random or accidental pattern made by a spill or blotch of ink.

Origin:

Early 20th century: from ink + blot. the word is used in psychology to describe the rorschach test, in which patients are shown inkblots and asked to describe what they see.

Examples:

1. The inkblot ruined the once-pristine sheet of paper.
2. An inkblot test is a tool used in psychology to evaluate personality and emotional functioning.
3. The inkblot experiment revealed how people's perceptions can be influenced by their experiences.
4. The artist used inkblots to create abstract designs.
5. The inkblot on his shirt was a reminder of his carelessness.