 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is a bird in the cage, or is it? As always, adult supervision is required. What you need for this experiment is paper, scissors, string, glue, and a pen. So it started off, I have in the description a link to this printout. So you're able to print out the bird cage and the bird, and then you're going to have an adult help you cut out the two circles. So just get a couple circles cut out here, one with the bird and one with the cage. And I'll speed this up because you probably don't need to watch me see how well my cutting skills are. So while we're cutting this out, we want to, it doesn't have to be precise, but right around the outside of the lines, you're going to have this cut out and then we're going to glue the back of each side of those. So once we get these completely cut out here, then we are going to flip them up. Now, it's important which direction they go, so you do have to make sure you get the glue on. You want to make sure that the cage, the bird is right side up. It's the easy way for me and the cage is upside down. So then you put your string right down in the middle, bird's right side up, and then you'll have the cage the other way. So go ahead and check to make sure the cage is upside down on the back. It's very important and the bird is facing straight up and now you grab your string and start spinning it around and you'll notice it's when you go around, the bird looks like it's inside the cage. This bird in the cage is an optical illusion called a thomothrope. It is the beginning of animation as we know it and at the surface it doesn't seem to be the same concept. However, while both basically make use of fast-changing frames and or image to create a visual illusion. A thomothrope is caused by an image or light in a different location while the animation in a different image or light in the same location. This time I'm drawing my own and so what I'm doing is I took a piece of cardstock at four inch by two inch and I folded in half and then I drew one image of a stick figure on the bottom part, which is now on the top. And then I'm drawing a second image of a jail cell on the bottom and my pen is not really working with me here. So I'm going to come back with a sharpie and highlight that a little bit better. But this just shows that you can draw your own or you could do in the go in the description and grab the print out that I had for the bird in the cage. You're going to take the string and you want to put it right in the middle of the bottom two inches. First you take your glue stick and go ahead and cover up both sides of the cardstock. And then you're going to stick that string in the middle of the bottom bottom half of it right there. And then when you fold it over, it should be right there where last time we cut out two circles and put them together. And then we have our image there. So I'm going to come back and highlight it here with a sharpie. And then once I get it completely ready, I'm going to switch over to a thicker sharpie here. And we'll get the cage a little bit thicker here. You can use different colors where I basically are just using black and white here, but you can use all kinds of different colors or come up with different images where I'm just using the bird in the cage and a man in a jail cell. Once you have this done, then you want to make sure that one image is facing the right direction. It doesn't really matter with the bars here. And then you give it a look, I did matter. I had it upside down and then I spin it and you can see when it spins really quick, the unhappy man is in jail. Go ahead and go into the description and print out the bird in the cage or come up with your own design and leave in the comments below what you came up with as I only did the man with the jail cell and the bird with the cage. And also if you used any different colors, I'd love to hear about that on which ones you came up with. Remember, the cage has to be upside down on the back and the bird right side up for that one to work. I hope you enjoyed this video. Remember to click thumbs up and to subscribe as we do a new video every day. Thanks for watching.