OK, let's Undo the Bottom Layer.

Newer Older

Oops! That can't be right!

If the top layers were there before the bottom layers, they would have been floating in midair!

• Remember: If A is on top of B, A is usually more recent than B.

Credits

Bird pictures adapted from http://www.conversion.org/birds.gif, used with permission.

Written by Marvin Simkin Filename undolyr2.html Last updated September 26, 2002