Hourglass - 30-minute timer in chartreuse (yellow-green)

 For those who don't always have a full hour, here is a half-hour hourglass - shaped from chartreuse-colored (yellow-green) glass

Watching the sand trickle away can be wonderfully calming - because in the end, not all that much happens during the time that has passed.

So, take a deep breath and let time slip by.

Also ideal as a learning aid or just because. 

For those who have or need more time, we have the one-hour glass here

Size: 20 cm high and 8 cm wide.