> A Child does not discover the world by learning abstract rules. Instead it learns by looking at concrete examples. An example contains the rules as well. In contrast to rules, the recognition of examples can be based on **tangible** reality. […]
KÜHNE, Thomas, 1999. A functional pattern system for object-oriented design. researchgate 
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tangible | BrE ˈtandʒɪbl, AmE ˈtændʒəb(ə)l | adjective 1 (perceptible by touch) fühlbar ‹Schwellung, Verdickung, Verhärtung› 2 (figurative) (real, definite) greifbar; spürbar, merklich ‹Unterschied, Verbesserung›; handfest ‹Beweis› ▸ tangible assets (Economics) Sachanlagevermögen (Neutr.)