In 'The War of the Worlds', the advanced fictional materials of the Martians' technology emphasize the theme of human vulnerability. Their superior materials in their war machines show how unprepared humanity is for a more technologically advanced foe, making us question our place in the universe.
In 'The Invisible Man', the fictional material that enables invisibility highlights themes of isolation and the corrupting influence of power. The main character, once invisible, becomes detached from society and his actions spiral out of control.
For 'The Time Machine', the mysterious material of the time machine is central to the themes of evolution and the passage of time. By using this fictional material to travel through time, the protagonist witnesses the evolution of humanity in different eras, which makes us think about the future and past of our own species and how we change over time.