H.R. Giger, the Swiss artist responsible for ruining sleep for millions of people, died Monday night after a fall at age 74. Influenced by H.P. Lovecraft, his vividly nightmarish style across various media led him to work with numerous directors, most famously creating the Alien from Ridley Scott’s classic. In memoriam, here’s a collection of some of Giger’s iconic work through the years.

One of Giger’s main themes was the connection between man and machines, which he called “biomechanics.”

35 years later, this is still the most terrifying Alien of all time. We won’t be surprised if it never gets topped.