0 (of films, pictures etc) filmed, shown etc by an apparatus taking or showing two photographs at different angles, so that a three-dimensional image is produced. -- stereoscopico
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Possiamo completarlo passo dopo passo, indipendentemente dalla lunghezza della strada, e non può essere completato, per quanto breve sia la strada, se non segni nemmeno la tua impronta.