Final answer:
Impressionist Pierre-Auguste Renoir and Post-Impressionist Vincent van Gogh share a similarity in their use of vibrant colors and light to capture atmospheric effects in their paintings.
Step-by-step explanation:
One similarity between the paintings of Impressionist Pierre-Auguste Renoir and those of Post-Impressionist Vincent van Gogh is their revolutionary approach to using light and color. Both artists worked en plein air, capturing the effects of sunlight in their work, which resulted in a vibrant color palette and a focus on natural light rather than conventional shadowing. While Renoir's works often depicted social settings and were characterized by freely applied brushstrokes, van Gogh's paintings were bolder, with thick layers of paint and a more abstract use of color to express emotion and subjectivity. Yet, their use of bright colors and innovative treatment of light in atmospheric conditions links Renoir's impressionist technique to van Gogh's post-impressionist style.