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One of the biggest obstacles during the installation of the ambient display was trying to connect to the Internet via the school network. As we were using an Arduino microcontroller with an Ethernet shield, it was quite challenging to negotiate network authentication via the school's proxy server. If possible, it is recommended to use a GPRS/GSM shield or similar when installing Internet-connected prototypes ``in the wild'', as the existing network infrastructure could cause unexpected problems.  It can also be challenging to come up with ten easily distinguishable colours using RGB LEDs. When mixing RGB colours using LEDs, the colour black is not available, and it becomes difficult to tell the colours brown and orange apart. Figure \ref{fig:colours} show the final colour palette we came up with.    TODO Guesstimate initial targets for number of steps   - Formule b/a * 5   Other practical considerations include that if you want the teacher to provide data, give a template with the required format. This helps to not have to unnecessarily transcribe documents e.g. converting ``1 min 48 sec'' to ``00:01:48''.