Over the seasons and years, a rectangled piece of furniture also known as Door made several changes throughout each season.
Season 1 (1998-1999)
The original design of Door only lasted for 10 episodes. Balls, Shoes, Hats, Dancing, Jackets, Food, Books, Music, Water, and Transportation. Door is swirly and white with pink squiggles, a navy blue door frame at the top, and a navy blue doorknob at the bottom.
Inside Door is a whitish grey closet with a navy blue shelf. Elmo would usually fall out after opening Door at the beginning of each segment
Season 2 (2000)
Door was completely updated with a darker colored blue door frame at the top, and the line is much wider. Door is more pink, with less swirls than the previous design. The doorknob is darker blue.
Inside Door is a yellow closet with red swirls.
Season 3 (2001)Similar to the previous design, except Door was given a brighter enhancement.
Seasons 4-5 (2001-2003)
Door was given a darker enhancement.
Seasons 6-11 (2004-2009)
Simular to the 2nd design, except the door is even wider