There's a reason this chair has holes in it.
Designer Tuomas Markunpoika Tolvanen was inspired by his grandmother, who has Alzheimer's disease, and created a chair which retains the shape of a solid chair.
He made it by welding steel rings over an existing wooden chair, and then burning away the original chair with fire.
Before the burning.
Engineering Temporality by Tuomas Markunpoika Tolvanen, Dezeen>>