I believe you are thinking of what are called Illusion cards. some have tricks of perceptual vision, 3-d overlays, color changes, etc. others work on different colors, perspective and such things as geometric Moire patterns associated with Science Fiction, the video communications screens on Star Trek would dissolve into Moire patterns when not in use- and they were also used in the Time Tunnel , sometimes called infinity patterns. good luck . Edmund Scientific used to sell sets of illusion cards.They probably still do.
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One can find pictures of girls in tight skirts on a number of sites, some reputable, some not. The reputable ones include a website which is called The Chive.
You have two options, you can make contact with local tattoo shops and go meet them in person and see their lettering, or you can do it from home on a website called TattooFinder, it offers pictures of most you will find in any shop.
There are these things called Magnetacks that will hang up your pictures without damaging them. They use magnets so they don't actually puncture or damage your items in any way like tape or thumbtacks would. They're really strong but still inexpensive too. http://www.themagnetack.com
There are alot of different Japanese masks, they are called Noh masks and hanya is a type of them. If you type in Google 'Noh Masks' it comes with unlimited references and pictures. Enjoy!
Cutting up various publications and gluing them into a new and artistic pattern is called collage.
Knight competitions were called tourneys. Various specific aspects of competition had different names, but the most famous was called jousting.
Pictures of wood boats can be found or viewed on various places. Some books and magazines print these pictures. A site called Flickr also has these photos posted once in a while.
One can find cityscape pictures from a company called Skyline Scenes. They have a wide array of pictures of various cities. Eazy Wallz also has cityscape pictures designed to decorate walls.
Reefs contain little animals called "polyps" they create the reefs color, the reef also has a various number of animals like fish!
pictures are called "des images" in French
Front Magazine contains stories on music, film, gadgets and games, fashion, and sports. This magazine also features glamour shoots with models and may contain nude pictures of the models.
The song is called Pictures of You by The Last Goodnight
Small pictures are icons.
Dingbats!
It is called Hieroglyphics
Helping verbs are also known as auxiliary verbs. They are used in combination with main verbs to express various tenses, voices, moods, and aspects in a sentence.