Tool(s) used?

What tool(s) were used to create this drawing? (yes, red Ink & Colored Pencil On Paper is part of the answer) For more images and details about his work click here.

Tim Hawkinson, Wall Chart Of World History From Earliest Times To The Present, 1997

Radio Drawing

Thank you Paul for the idea and letting us borrow your radios and thank you Michelle for letting us borrow your radios. We had 5 groups of 4 students. The Activator starts the drawing, a real-time event. The Mediator transfers the information to the (3rd party) other Mediator, which is then relayed to the Receiver. The drawings are based on observation and the Activator and Receiver are drawing simultaneously.

Pictured below: The Activator creating the drawing and the mediator relaying the information.

The Mediator relaying the information to the Receiver.

The Activator creating the drawing and the mediator relaying the information.

The Mediator relaying the information to the Receiver.