Final answer:
Restaurateurs in the early 20th century used design elements from steamships and streamliner trains to create safe and hygienic restaurants. The use of glass, stainless steel, and white porcelain in the design gave customers confidence in the safety of their food. Later, restaurant chains shifted towards more environmental-themed landscapes.
Step-by-step explanation:
Restaurateurs during the early 20th century borrowed design elements from steamships and streamliner trains to convince customers that their food was safe. They used actual dining cars from railroads as hamburger restaurants and called them diners. Architecture was also used to evoke the sleek and luxurious ocean liners and airplanes of the time. These hygienic and modern designs incorporated glass, stainless steel, and white porcelain, giving the restaurants a dentist's office aesthetic and assuring the public of the safety of their food. Eventually, restaurant chains like McDonald's abandoned the high-tech and hygienic-modern look for more environmental-themed landscapes in the 1970s.