Lemons grow on trees and are a hybrid of citron and lime. Being very tart, they are not eaten on their own but have many culinary uses, from lemonade to garnishes. They are high in Vitamin C, Vitamin B6 and potassium.

One of the most versatile of the shapes, I can be almost anything you want - a full stop, a ball to play with, a berry, a coloured light, part of an eye... the list is endless!

Simple, classic and elegant, I work as a frame for artwork, a colour mask, or a mount within an outer frame.

I'm a heart - what's not to love? Obviously I'm essential for your Valentine scenes, but there's so much more to me than that. You need me to play cards, for instance. Turn me upside down and add a vertical line to make the spade, and make the diamond by overlapping two of me, one upside down. The only suit I can't make is the club. Clever, eh?

When you need to draw the line, I'm always ready to assist. Use me on my own or with my friends as part of a border or more complicated structure; very few shapes are more versatile than I am.

When you need to draw the line, I'm always ready to assist. Use me on my own or with my friends as part of a border or more complicated structure; very few shapes are more versatile than I am.

I am happy to join my shape friends. I am an oval, a slightly squashed version of a circle. I don’t roll well, but I make great cat eyes. You can use me to create eggs or holes in the ground, be careful you don’t fall in. I am also great as a plate; you can decorate me around the edges or the middle and place yummy treats on me. Play with me, and pair me with other shapes to make your art slides fun and unique.

I am happy to join my shape friends. I am an oval, a slightly squashed version of a circle. I don’t roll well, but I make great cat eyes. You can use me to create eggs or holes in the ground, be careful you don’t fall in. I am also great as a plate; you can decorate me around the edges or the middle and place yummy treats on me. Play with me, and pair me with other shapes to make your art slides fun and unique.

I am jumping in to join my shape friends. Don’t I look terrific? I am a pentagon, and I have five sides and five corners. Your pets can have so much fun fitting me together to form unusual art. A single pentagon looks like the silhouette of a barn or house. Put a few of me together, and I make good paving stones or wall decorations. Play around with me and see what new animals or fun buildings you can create.

I am jumping in to join my shape friends. Don’t I look terrific? I am a pentagon, and I have five sides and five corners. Your pets can have so much fun fitting me together to form unusual art. A single pentagon looks like the silhouette of a barn or house. Put a few of me together, and I make good paving stones or wall decorations. Play around with me and see what new animals or fun buildings you can create.

We have puzzle shapes, but I have come to join in the fun as they were a bit lonely with no connecting puzzle pieces to join up with. Now you can finish a whole puzzle. When you are done having fun joining me up with my pals, you and your pets can decide on what picture should be on me if you want a picture.

We have puzzle shapes, but I have come to join in the fun as they were a bit lonely with no connecting puzzle pieces to join up with. Now you can finish a whole puzzle. When you are done having fun joining me up with my pals, you and your pets can decide on what picture should be on me if you want a picture.

You can, of course, also use any of the plain coloured backgrounds as a rectangle, but I still have my place; my proportions are different. I'm somewhere between the background rectangle and the square. Because, you know, not all rectangles are equal.

Yes, I'm a square, but I'm not as square as you might think! I'm actually very cool and some even call me hot. You see, some of my colours are 'cool' (green, blue and purple) and some are 'hot' (red, orange, and yellow). I am definitely the hippest square you have ever seen!

I'm a five-pointed star, one of the more complex shapes the penguins make. Use me on my own or as part of a repeating pattern. I'm a particularly fun addition to the top of a Christmas tree or a piece of festive bunting.

Thin lines are great. Some of my best friends are thin lines. But for when you need something just a bit more substantial, I'm here to help. I may be plain and basic, but I'm as versatile as your imagination, and remember I come in the same shades as the plain backgrounds so you can also use me as a colour mask.

I'm a neat equilateral triangle, perfect for all manner of artistic compositions. Take six of me and you can build a hexagon, either in a single colour or any scheme of your choice.

One of the world's earliest significant inventions, I'm now even more useful than I was when I was first thought of. I'm essential if you want to build your own transport, from a unicycle to a juggernaut. I think I look particularly good on a pram, though I do say so myself.

Australia's Aboriginal flag is one of three official Australian flags. Its background is black for the aboriginal people and red for the red earth and ochre used in traditional ceremonies, with the sun in the foreground.

There is a constant interaction between elements, for example, when fire forms earth by way of volcanoes and ash. Some species of plants and trees actually need fire for their seeds to sprout. In this collection of images, we can see both parts of this cycle, plus celebration candles and fireworks, a soothingly earth-toned residence and dramatic pictures of Planet Earth!