In addition to a surprising amount of
space, the Spark's interior is as modern as the outside thanks to the body - colored trim pieces and motorcycle -
inspired instrument panel.
The enclosed environment — which included a composting toilet, plants, a ten - day supply of food and water, basic bedding, a treadmill,
instruments, and a three - camera video - surveillance system — was
inspired by the simulation projects conducted by universities and
space agencies to test the viability of human life on spacecrafts and on Mars.