X-Ray box

The X-Ray Box is a block, which when powered by a redstone signal, allows the player to see through the walls the it touches. Once the block loses the redstone signal, it vanishes. This means each X-ray box can only be used once after being crafted.

Crafting
To craft 4x X-ray box, you need 4x redstone, 4x uranium nugget, and 1x netherrack.

Uses
The X-Ray box can be used to easily search for underground caves that contain useful ores. Large sections of the ground can be searched by building 2-block chains or grids, as shown in the images on the right. The grid allows you to see a much bigger area, but can be annoying or confusing because every second block is still hidden.