A paper knife with the blade hidden inside the “shell.”
▼裁纸刀外观造型，General view © Akihiro Yoshida
▼草图，Sketch © nendo
When an envelope is passed through the slit on the side, a blade attached to the inner spiral enters under the flap, and opens the envelope. A 3D printer was used to achieve the complex shape of the exterior morphing into the blade, but because of the limited sharpness of the blade, repeated experiments were performed for the cutter’s right shape, angle, and distance from the slit.
▼裁切示意，Way of cutting © Akihiro Yoshida
▼外观细节，Detailed view © Akihiro Yoshida
The name of the paper knife “Nautilus” comes from the appearance like a spiral seashell of nautilus or ammonite.
▼黑色款，The black version © Akihiro Yoshida
Collaborator: Masahiro Ohgami
Photographer: Akihiro Yoshida