Plastic stools are useful pieces of furniture to keep around the house. You can use a stool to rest your legs, sit on it, use it to keep books or other things, keep artifacts on it, and so on. Stools, unlike chairs, can be styled and designed in so many quirky ways possible.
Stools promote dynamic movement and an upright posture, which is beneficial for short-term use. However, it's important to recognize that they may not be as ergonomic as chairs for longer periods. Their lack of lumbar support leads to possible slouching when used over extended periods.