A whole week passed by without uploading the homework here... but here it comes.
We learned (learnt?) about shutter speed or exposure time.
This is a very intuitive concept, it controls the time that shutter remains open to allow light to go into the sensor or film. Small number, e.g. 1/500 sec., means that the shutter opens and closes very fast. Large numbers, e.g. 20 sec., will open the shutter for longer time (20 sec.) and close it again.
For example, if you are in a park and take a picture of a pigeon starting to fly, then you can have very different results depending (among others) on the exposure time you use. A 1/1000 sec will give you the image of the pigeon in the air, just floating there with the wings in a "flying" position. In contrast, a larger number (maybe a 1 sec.?) will create an image where the parts of the pigeon that are moving are blurred. You could say that the first image is a static image, and the second a dynamic image. Some photos about this will come in the future (cross my fingers).
The homework was to play with long (exposure) times in the night and use small light sources. There are lots of beautiful photos taken like this: light graffiti. There are even movies, for example PiKaPiKa (thanks Wilco). All these examples keep the camera still, and move light sources around to create the figure you want... well, our homework was to do the contrary. Use a light source and move the camera, and here are some of my photos:
(click on the images for a larger image)