A ladder is a vertical or inclined set of rungs or steps. There are two types: rigid ladders that can be leaned against a vertical surface such as a wall, and rope ladders that are hung from the top. Ladders are ancient tools and technology. A ladder is featured in a Mesolithic rock painting that is at least 10, 000 years old, depicted in the Spider Caves in Valencia, Spain. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NYPL / Science Source |
Bildgröße: | 3058 px × 4088 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |