lustrem

In a sentence

• Patrzyłem na swoje odbicie w lustrem.

  I looked at my reflection in the mirror.

  Here, 'lustrem' is used as the instrumental case of the noun 'lustro', meaning mirror. It specifies the instrument or means through/by which the action is performed or the manner in which it occurs.

• Stół został przykryty lustrem, aby wyglądał bardziej elegancko.

  The table was covered with a mirror to make it look more elegant.

  In this sentence, 'lustrem' again appears in instrumental case, indicating the means used to achieve a particular result or to describe how something is done.

• Dziecko bawiło się lustrem, tworząc odbicia światła na ścianie.

  The child was playing with a mirror, creating light reflections on the wall.

  Here as well, 'lustrem' is in instrumental case, showing the means or tool used by the subject to carry out an activity.