We are representing physical containers by delimiting boundaries and basic facts by empty containers.
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represent | BrE ˌrɛprɪˈzɛnt, AmE ˌrɛprəˈzɛnt | transitive verb 1 (symbolize) verkörpern 2 (denote, depict, present) darstellen (as als) (Theatre also) spielen ▸ the symbol x represents guttural sounds das Zeichen x steht für Gutturallaute ▸ I am not what you represent me as or to be ich bin nicht so, wie du mich hinstellst 3 (correspond to) entsprechen (+ Dat.) 4 (be specimen of, act for) vertreten