pavement lights
... that the purple "jewels" in old sidewalks are pavement lights, which bend daylight into the basement below?
... that the purple "jewels" <i id="mwBOk">(pictured)</i> in old sidewalks are <b id="mwBOo"><a href="./Pavement_light" id="mwBOs" rel="mw:WikiLink" title="Pavement light">pavement lights</a></b>, which <a href="./Prism_lighting" id="mwBOw" rel="mw:WikiLink" title="Prism lighting">bend daylight</a> into the basement below?