I love my Fiskars paper slicer. It's:

• Light and portable, and can be clipped into a binder.
• Saves room on my desk, since it saves me from taking out a cutting mat, a ruler, and an X-Acto knife to perform the same task.
• Has both Metric and Imperial measures.
• The grid pattern assists with measurement and evening out crooked edges.

I plan to design a practical and aesthetically appealing solution for messy incense ash.

Many traditional incense holders cannot store much ash, and are difficult to transport to the trash can without spilling. The ash sits on a fairly flat surface, which doesn't protect the ash from wind.