The E-Ball is a spherical PC designed by Apostol Tnokovski that measures only 160mm in diameter, making it the smallest PC ever made. It uses a projected keyboard and display, projecting the desktop onto a paper sheet or wall. The E-Ball contains components like a dual-core processor, 2GB RAM, hard drive, integrated graphics and sound card, speakers, and webcam. It works by pressing a button to pop up the LCD projector, then using the virtual projected keyboard and optical mouse. While very small and portable, it also has disadvantages like only working with specialized operating systems and high cost.