period from June 18 to June 22, will show a purple button with the silhouette of a paw print at the top of the search results. An animation of a dog's paw pressing the button will play as you idle. Clicking on the button will cause the button to disappear, and a dog will bark as it presses down on the page and leaves a paw print in its place. Clicking anywhere else on the page will cause more dogs to bark as they leave their paw prints on the results page. Clicking on the "X" at the bottom will cause a water animation/effect to play with the sounds of a sink as the paw print(s) are washed off of the search results. "wizard of oz" will display a pair of ruby slippers in the Knowledge Graph. Clicking on them will cause the page to spin in a tornado-like effect while an audio file of Judy Garland saying "there's no place like home" is heard. After the effect finishes, the page is seen in a sepia tone only. If the tornado is clicked, an audio file from the movie when the tornado hits plays, the page spins again and returns to color. As of late 2020, this is no longer available. For the 25th anniversary of the TV series Friends, Google embedded Easter eggs for , , , , and in their respective Knowledge Graphs. Embedded tools A Google web search for: "" will have a 60-second breathing exercise. "" on a mobile device will have an interactive spirit level. However, this is not supported on other devices. "" will cause a wrapped present to fall from the top of the screen into the webpage embedded. Clicking on this will take you to Google Santa Tracker. "" will provide a color picker and a conversion between RGB and hexadecimal color values. Selecting "Show color values" will also show conversions to the CMYK, HSL and HSV color models. "" will pull up an Earth Day quiz to see what animal you are. "" will flip a coin: heads or tails. "" or "i'm feeling curious" will show a fun fact. Once a search result has been given, clicking on "Ask another question" will show another question. It will show a short fact in about 1-3 sentences and a link to the website where the fact was found within a featured box